diff --git a/GUI/index.html b/GUI/index.html
index 7a382e5..bae3b7f 100644
--- a/GUI/index.html
+++ b/GUI/index.html
@@ -635,20 +635,6 @@
         </div>
     </div>
 
-    <!-- Installation effects overlay -->
-    <div id="installationEffects" class="installation-effects" style="display: none;">
-        <div class="space-effects">
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-            <div class="warp-line"></div>
-        </div>
-    </div>
-
     <div id="chatUsernameModal" class="chat-username-modal" style="display: none;">
         <div class="chat-username-modal-content">
             <div class="chat-username-modal-header">
diff --git a/GUI/js/mods.js b/GUI/js/mods.js
index 4524a98..0ebda25 100644
--- a/GUI/js/mods.js
+++ b/GUI/js/mods.js
@@ -1,5 +1,5 @@
 
-let CF_API_KEY = "$2a$10$bqk254NMZOWVTzLVJCcxEOmhcyUujKxA5xk.kQCN9q0KNYFJd5b32";
+let API_KEY = "$2a$10$bqk254NMZOWVTzLVJCcxEOmhcyUujKxA5xk.kQCN9q0KNYFJd5b32";
 const CURSEFORGE_API = 'https://api.curseforge.com/v1';
 const HYTALE_GAME_ID = 70216;
 
@@ -12,7 +12,9 @@ let modsTotalPages = 1;
 
 export async function initModsManager() {
   try {
-    console.log('Loaded API Key:', CF_API_KEY ? 'Yes' : 'No');
+    if (window.electronAPI && window.electronAPI.getEnvVar) {
+      console.log('Loaded API Key:', API_KEY ? 'Yes' : 'No');
+    }
   } catch (err) {
     console.error('Failed to load API Key:', err);
   }
@@ -194,7 +196,7 @@ async function loadBrowseMods() {
   browseContainer.innerHTML = `<div class="loading-mods"><div class="loading-spinner"></div><span>${window.i18n ? window.i18n.t('mods.loadingMods') : 'Loading mods from CurseForge...'}</span></div>`;
 
   try {
-    if (!CF_API_KEY || CF_API_KEY.length < 10) {
+    if (!API_KEY || API_KEY.length < 10) {
       browseContainer.innerHTML = `
         <div class=\"empty-browse-mods\">
           <i class=\"fas fa-key\"></i>
@@ -221,7 +223,7 @@ async function loadBrowseMods() {
 
     const response = await fetch(url, {
       headers: {
-        'x-api-key': CF_API_KEY,
+        'x-api-key': API_KEY,
         'Accept': 'application/json'
       }
     });
diff --git a/GUI/js/settings.js b/GUI/js/settings.js
index 8b7e275..29b7065 100644
--- a/GUI/js/settings.js
+++ b/GUI/js/settings.js
@@ -207,11 +207,6 @@ function setupSettingsElements() {
   }
 
 
-  if (closeLauncherCheck) {
-    closeLauncherCheck.addEventListener('change', saveCloseLauncher);
-  }
-
-
   // UUID event listeners
   if (copyUuidBtn) {
     copyUuidBtn.addEventListener('click', copyCurrentUuid);
@@ -397,31 +392,6 @@ async function loadCloseLauncher() {
 }
 
 
-async function saveCloseLauncher() {
-  try {
-    if (window.electronAPI && window.electronAPI.saveCloseLauncher && closeLauncherCheck) {
-      const enabled = closeLauncherCheck.checked;
-      await window.electronAPI.saveCloseLauncher(enabled);
-    }
-  } catch (error) {
-    console.error('Error saving close launcher setting:', error);
-  }
-}
-
-async function loadCloseLauncher() {
-  try {
-    if (window.electronAPI && window.electronAPI.loadCloseLauncher) {
-      const enabled = await window.electronAPI.loadCloseLauncher();
-      if (closeLauncherCheck) {
-        closeLauncherCheck.checked = enabled;
-      }
-    }
-  } catch (error) {
-    console.error('Error loading close launcher setting:', error);
-  }
-}
-
-
 async function savePlayerName() {
   try {
     if (!window.electronAPI || !settingsPlayerName) return;
diff --git a/GUI/js/ui.js b/GUI/js/ui.js
index 1efb6f6..44182cb 100644
--- a/GUI/js/ui.js
+++ b/GUI/js/ui.js
@@ -638,9 +638,6 @@ function setupUI() {
   // Setup retry button
   setupRetryButton();
 
-  // Setup draggable progress bar
-  setupProgressDrag();
-
   lockPlayButton(true);
 
   setTimeout(() => {
@@ -741,6 +738,7 @@ window.LauncherUI = {
 
 // Make installation effects globally available
 
+
 // Draggable progress bar functionality
 function setupProgressDrag() {
   if (!progressOverlay) return;
diff --git a/GUI/style.css b/GUI/style.css
index 4938c3c..8a6e826 100644
--- a/GUI/style.css
+++ b/GUI/style.css
@@ -1770,252 +1770,252 @@ body {
     animation: shimmer 2s infinite;
 }
 
-@keyframes shimmer {
-    0% {
-        left: -100%;
-    }
-
-    100% {
-        left: 100%;
-    }
-}
-
-/* Progress Error and Retry Styles */
-.progress-error-container {
-    margin-top: 0.75rem;
-    padding-top: 0.75rem;
-    border-top: 1px solid rgba(239, 68, 68, 0.3);
-    animation: errorSlideIn 0.3s ease-out;
-}
-
-@keyframes errorSlideIn {
-    from {
-        opacity: 0;
-        transform: translateY(-10px);
-    }
-    to {
-        opacity: 1;
-        transform: translateY(0);
-    }
-}
-
-.progress-error-message {
-    color: #f87171;
-    font-family: 'JetBrains Mono', monospace;
-    font-size: 0.75rem;
-    margin-bottom: 0.5rem;
-    text-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
-    line-height: 1.4;
-}
-
-.progress-retry-section {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    gap: 0.75rem;
-}
-
-.progress-retry-buttons {
-    display: flex;
-    gap: 0.5rem;
-    flex-wrap: wrap;
-}
-
-.progress-retry-info {
-    color: #fbbf24;
-    font-family: 'JetBrains Mono', monospace;
-    font-size: 0.7rem;
-    flex: 1;
-}
-
-.progress-retry-btn {
-    background: linear-gradient(135deg, #dc2626, #ef4444);
-    color: white;
-    border: none;
-    padding: 0.5rem 1rem;
-    border-radius: 6px;
-    font-family: 'JetBrains Mono', monospace;
-    font-size: 0.75rem;
-    font-weight: 600;
-    cursor: pointer;
-    transition: all 0.2s ease;
-    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
-    white-space: nowrap;
-    min-width: 120px;
-}
-
-.progress-retry-btn:hover {
-    background: linear-gradient(135deg, #b91c1c, #dc2626);
-    transform: translateY(-1px);
-    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
-}
-
-.progress-retry-btn:active {
-    transform: translateY(0);
-    box-shadow: 0 2px 6px rgba(220, 38, 38, 0.3);
-}
-
-.progress-retry-btn:disabled {
-    background: linear-gradient(135deg, #4b5563, #6b7280);
-    cursor: not-allowed;
-    transform: none;
-    box-shadow: none;
-    opacity: 0.6;
-}
-
-/* Progress overlay error state */
-.progress-overlay.error-state {
-    border-color: rgba(239, 68, 68, 0.5);
-    box-shadow:
-        0 4px 16px rgba(0, 0, 0, 0.5),
-        0 0 30px rgba(239, 68, 68, 0.2),
-        inset 0 1px 0 rgba(255, 255, 255, 0.05);
-}
-
-.progress-overlay.error-state #progressBarFill {
-    background: linear-gradient(90deg, #dc2626, #ef4444);
-    animation: errorPulse 1.5s ease-in-out infinite;
-}
-
-@keyframes errorPulse {
-    0%, 100% {
-        opacity: 0.8;
-    }
-    50% {
-        opacity: 1;
-    }
-}
-
-/* Error type specific styling */
-.progress-error-container.error-network {
-    border-top-color: rgba(59, 130, 246, 0.5);
-}
-
-.progress-error-container.error-network .progress-error-message {
-    color: #60a5fa;
-    text-shadow: 0 0 8px rgba(96, 165, 250, 0.4);
-}
-
-.progress-error-container.error-stall {
-    border-top-color: rgba(245, 158, 11, 0.5);
-}
-
-.progress-error-container.error-stall .progress-error-message {
-    color: #fbbf24;
-    text-shadow: 0 0 8px rgba(251, 191, 36, 0.4);
-}
-
-.progress-error-container.error-file {
-    border-top-color: rgba(239, 68, 68, 0.5);
-}
-
-.progress-error-container.error-file .progress-error-message {
-    color: #f87171;
-    text-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
-}
-
-.progress-error-container.error-permission {
-    border-top-color: rgba(168, 85, 247, 0.5);
-}
-
-.progress-error-container.error-permission .progress-error-message {
-    color: #a855f7;
-    text-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
-}
-
-.progress-error-container.error-server {
-    border-top-color: rgba(236, 72, 153, 0.5);
-}
-
-.progress-error-container.error-server .progress-error-message {
-    color: #ec4899;
-    text-shadow: 0 0 8px rgba(236, 72, 153, 0.4);
-}
-
-.progress-error-container.error-corruption {
-    border-top-color: rgba(220, 38, 38, 0.8);
-}
-
-.progress-error-container.error-corruption .progress-error-message {
-    color: #dc2626;
-    text-shadow: 0 0 8px rgba(220, 38, 38, 0.6);
-    font-weight: 600;
-}
-
-.progress-error-container.error-butler {
-    border-top-color: rgba(245, 158, 11, 0.5);
-}
-
-.progress-error-container.error-butler .progress-error-message {
-    color: #f59e0b;
-    text-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
-}
-
-.progress-error-container.error-space {
-    border-top-color: rgba(168, 85, 247, 0.5);
-}
-
-.progress-error-container.error-space .progress-error-message {
-    color: #a855f7;
-    text-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
-}
-
-.progress-error-container.error-conflict {
-    border-top-color: rgba(6, 182, 212, 0.5);
-}
-
-.progress-error-container.error-conflict .progress-error-message {
-    color: #06b6d4;
-    text-shadow: 0 0 8px rgba(6, 182, 212, 0.4);
-}
-
-/* Connection quality indicators */
-.progress-details {
-    transition: all 0.3s ease;
-}
-
-.progress-details #progressSize {
-    transition: color 0.5s ease;
-}
-
-/* Enhanced retry button states */
-.progress-retry-btn.retrying {
-    background: linear-gradient(135deg, #059669, #10b981);
-    animation: retryingPulse 1s ease-in-out infinite;
-}
-
-@keyframes retryingPulse {
-    0%, 100% {
-        transform: scale(1);
-        box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
-    }
-    50% {
-        transform: scale(1.05);
-        box-shadow: 0 4px 12px rgba(5, 150, 105, 0.4);
-    }
-}
-
-/* Network status indicator (optional future enhancement) */
-.network-status {
-    position: absolute;
-    top: 5px;
-    right: 5px;
-    width: 8px;
-    height: 8px;
-    border-radius: 50%;
-    background: #10b981;
-    box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
-}
-
-.network-status.poor {
-    background: #f87171;
-    box-shadow: 0 0 6px rgba(248, 113, 113, 0.6);
-}
-
-.network-status.fair {
-    background: #fbbf24;
-    box-shadow: 0 0 6px rgba(251, 191, 36, 0.6);
-}
+@keyframes shimmer {
+    0% {
+        left: -100%;
+    }
+
+    100% {
+        left: 100%;
+    }
+}
+
+/* Progress Error and Retry Styles */
+.progress-error-container {
+    margin-top: 0.75rem;
+    padding-top: 0.75rem;
+    border-top: 1px solid rgba(239, 68, 68, 0.3);
+    animation: errorSlideIn 0.3s ease-out;
+}
+
+@keyframes errorSlideIn {
+    from {
+        opacity: 0;
+        transform: translateY(-10px);
+    }
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+.progress-error-message {
+    color: #f87171;
+    font-family: 'JetBrains Mono', monospace;
+    font-size: 0.75rem;
+    margin-bottom: 0.5rem;
+    text-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
+    line-height: 1.4;
+}
+
+.progress-retry-section {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    gap: 0.75rem;
+}
+
+.progress-retry-buttons {
+    display: flex;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+}
+
+.progress-retry-info {
+    color: #fbbf24;
+    font-family: 'JetBrains Mono', monospace;
+    font-size: 0.7rem;
+    flex: 1;
+}
+
+.progress-retry-btn {
+    background: linear-gradient(135deg, #dc2626, #ef4444);
+    color: white;
+    border: none;
+    padding: 0.5rem 1rem;
+    border-radius: 6px;
+    font-family: 'JetBrains Mono', monospace;
+    font-size: 0.75rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: all 0.2s ease;
+    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
+    white-space: nowrap;
+    min-width: 120px;
+}
+
+.progress-retry-btn:hover {
+    background: linear-gradient(135deg, #b91c1c, #dc2626);
+    transform: translateY(-1px);
+    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
+}
+
+.progress-retry-btn:active {
+    transform: translateY(0);
+    box-shadow: 0 2px 6px rgba(220, 38, 38, 0.3);
+}
+
+.progress-retry-btn:disabled {
+    background: linear-gradient(135deg, #4b5563, #6b7280);
+    cursor: not-allowed;
+    transform: none;
+    box-shadow: none;
+    opacity: 0.6;
+}
+
+/* Progress overlay error state */
+.progress-overlay.error-state {
+    border-color: rgba(239, 68, 68, 0.5);
+    box-shadow:
+        0 4px 16px rgba(0, 0, 0, 0.5),
+        0 0 30px rgba(239, 68, 68, 0.2),
+        inset 0 1px 0 rgba(255, 255, 255, 0.05);
+}
+
+.progress-overlay.error-state #progressBarFill {
+    background: linear-gradient(90deg, #dc2626, #ef4444);
+    animation: errorPulse 1.5s ease-in-out infinite;
+}
+
+@keyframes errorPulse {
+    0%, 100% {
+        opacity: 0.8;
+    }
+    50% {
+        opacity: 1;
+    }
+}
+
+/* Error type specific styling */
+.progress-error-container.error-network {
+    border-top-color: rgba(59, 130, 246, 0.5);
+}
+
+.progress-error-container.error-network .progress-error-message {
+    color: #60a5fa;
+    text-shadow: 0 0 8px rgba(96, 165, 250, 0.4);
+}
+
+.progress-error-container.error-stall {
+    border-top-color: rgba(245, 158, 11, 0.5);
+}
+
+.progress-error-container.error-stall .progress-error-message {
+    color: #fbbf24;
+    text-shadow: 0 0 8px rgba(251, 191, 36, 0.4);
+}
+
+.progress-error-container.error-file {
+    border-top-color: rgba(239, 68, 68, 0.5);
+}
+
+.progress-error-container.error-file .progress-error-message {
+    color: #f87171;
+    text-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
+}
+
+.progress-error-container.error-permission {
+    border-top-color: rgba(168, 85, 247, 0.5);
+}
+
+.progress-error-container.error-permission .progress-error-message {
+    color: #a855f7;
+    text-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
+}
+
+.progress-error-container.error-server {
+    border-top-color: rgba(236, 72, 153, 0.5);
+}
+
+.progress-error-container.error-server .progress-error-message {
+    color: #ec4899;
+    text-shadow: 0 0 8px rgba(236, 72, 153, 0.4);
+}
+
+.progress-error-container.error-corruption {
+    border-top-color: rgba(220, 38, 38, 0.8);
+}
+
+.progress-error-container.error-corruption .progress-error-message {
+    color: #dc2626;
+    text-shadow: 0 0 8px rgba(220, 38, 38, 0.6);
+    font-weight: 600;
+}
+
+.progress-error-container.error-butler {
+    border-top-color: rgba(245, 158, 11, 0.5);
+}
+
+.progress-error-container.error-butler .progress-error-message {
+    color: #f59e0b;
+    text-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
+}
+
+.progress-error-container.error-space {
+    border-top-color: rgba(168, 85, 247, 0.5);
+}
+
+.progress-error-container.error-space .progress-error-message {
+    color: #a855f7;
+    text-shadow: 0 0 8px rgba(168, 85, 247, 0.4);
+}
+
+.progress-error-container.error-conflict {
+    border-top-color: rgba(6, 182, 212, 0.5);
+}
+
+.progress-error-container.error-conflict .progress-error-message {
+    color: #06b6d4;
+    text-shadow: 0 0 8px rgba(6, 182, 212, 0.4);
+}
+
+/* Connection quality indicators */
+.progress-details {
+    transition: all 0.3s ease;
+}
+
+.progress-details #progressSize {
+    transition: color 0.5s ease;
+}
+
+/* Enhanced retry button states */
+.progress-retry-btn.retrying {
+    background: linear-gradient(135deg, #059669, #10b981);
+    animation: retryingPulse 1s ease-in-out infinite;
+}
+
+@keyframes retryingPulse {
+    0%, 100% {
+        transform: scale(1);
+        box-shadow: 0 2px 8px rgba(5, 150, 105, 0.3);
+    }
+    50% {
+        transform: scale(1.05);
+        box-shadow: 0 4px 12px rgba(5, 150, 105, 0.4);
+    }
+}
+
+/* Network status indicator (optional future enhancement) */
+.network-status {
+    position: absolute;
+    top: 5px;
+    right: 5px;
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background: #10b981;
+    box-shadow: 0 0 6px rgba(16, 185, 129, 0.6);
+}
+
+.network-status.poor {
+    background: #f87171;
+    box-shadow: 0 0 6px rgba(248, 113, 113, 0.6);
+}
+
+.network-status.fair {
+    background: #fbbf24;
+    box-shadow: 0 0 6px rgba(251, 191, 36, 0.6);
+}
 
 .progress-bar-fill {
     height: 100%;
@@ -5990,167 +5990,167 @@ select.settings-input option {
     to {
         opacity: 1;
     }
-}
-/* Launcher Update Modal Styles */
-.update-modal-overlay {
-    position: fixed;
-    top: 0;
-    left: 0;
-    width: 100%;
-    height: 100%;
-    background: rgba(0, 0, 0, 0.85);
-    backdrop-filter: blur(10px);
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    z-index: 100000;
-    animation: fadeIn 0.3s ease;
-}
-
-.update-modal {
-    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
-    border: 2px solid rgba(147, 51, 234, 0.3);
-    border-radius: 16px;
-    padding: 2rem;
-    max-width: 500px;
-    width: 90%;
-    box-shadow: 0 20px 60px rgba(147, 51, 234, 0.3);
-    animation: slideUp 0.3s ease;
-}
-
-@keyframes slideUp {
-    from {
-        transform: translateY(30px);
-        opacity: 0;
-    }
-    to {
-        transform: translateY(0);
-        opacity: 1;
-    }
-}
-
-.update-header {
-    display: flex;
-    align-items: center;
-    gap: 1rem;
-    margin-bottom: 1.5rem;
-    color: #9333ea;
-}
-
-.update-header i {
-    font-size: 2rem;
-}
-
-.update-header h2 {
-    margin: 0;
-    font-size: 1.5rem;
-    color: #fff;
-}
-
-.update-content {
-    color: #e0e0e0;
-    margin-bottom: 1.5rem;
-}
-
-.update-version {
-    font-size: 1.2rem;
-    font-weight: 600;
-    color: #9333ea;
-    margin-bottom: 0.5rem;
-}
-
-.current-version {
-    color: #888;
-    font-size: 0.9rem;
-    margin-bottom: 1rem;
-}
-
-.release-notes {
-    background: rgba(0, 0, 0, 0.3);
-    border-left: 3px solid #9333ea;
-    padding: 1rem;
-    border-radius: 8px;
-    max-height: 200px;
-    overflow-y: auto;
-    font-size: 0.9rem;
-    line-height: 1.6;
-}
-
-.update-progress {
-    margin-bottom: 1.5rem;
-}
-
-.progress-bar-container {
-    background: rgba(0, 0, 0, 0.3);
-    border-radius: 10px;
-    height: 20px;
-    overflow: hidden;
-    margin-bottom: 0.5rem;
-}
-
-.progress-bar {
-    height: 100%;
-    background: linear-gradient(90deg, #9333ea 0%, #7c3aed 100%);
-    width: 0%;
-    transition: width 0.3s ease;
-    border-radius: 10px;
-}
-
-.progress-text {
-    color: #aaa;
-    font-size: 0.9rem;
-    text-align: center;
-    margin: 0;
-}
-
-.update-note {
-    background: rgba(147, 51, 234, 0.1);
-    border: 1px solid rgba(147, 51, 234, 0.3);
-    padding: 0.75rem;
-    border-radius: 8px;
-    font-size: 0.9rem;
-    margin-top: 1rem;
-}
-
-.update-actions {
-    display: flex;
-    gap: 1rem;
-    justify-content: flex-end;
-}
-
-.update-actions button {
-    padding: 0.75rem 1.5rem;
-    border: none;
-    border-radius: 8px;
-    font-weight: 600;
-    cursor: pointer;
-    transition: all 0.2s;
-    display: flex;
-    align-items: center;
-    gap: 0.5rem;
-}
-
-.update-actions .btn-primary {
-    background: linear-gradient(135deg, #9333ea 0%, #7c3aed 100%);
-    color: white;
-}
-
-.update-actions .btn-primary:hover:not(:disabled) {
-    transform: translateY(-2px);
-    box-shadow: 0 5px 15px rgba(147, 51, 234, 0.4);
-}
-
-.update-actions .btn-secondary {
-    background: rgba(255, 255, 255, 0.1);
-    color: #e0e0e0;
-    border: 1px solid rgba(255, 255, 255, 0.2);
-}
-
-.update-actions .btn-secondary:hover:not(:disabled) {
-    background: rgba(255, 255, 255, 0.15);
-}
-
-.update-actions button:disabled {
-    opacity: 0.5;
-    cursor: not-allowed;
+}
+/* Launcher Update Modal Styles */
+.update-modal-overlay {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: rgba(0, 0, 0, 0.85);
+    backdrop-filter: blur(10px);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 100000;
+    animation: fadeIn 0.3s ease;
+}
+
+.update-modal {
+    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
+    border: 2px solid rgba(147, 51, 234, 0.3);
+    border-radius: 16px;
+    padding: 2rem;
+    max-width: 500px;
+    width: 90%;
+    box-shadow: 0 20px 60px rgba(147, 51, 234, 0.3);
+    animation: slideUp 0.3s ease;
+}
+
+@keyframes slideUp {
+    from {
+        transform: translateY(30px);
+        opacity: 0;
+    }
+    to {
+        transform: translateY(0);
+        opacity: 1;
+    }
+}
+
+.update-header {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+    margin-bottom: 1.5rem;
+    color: #9333ea;
+}
+
+.update-header i {
+    font-size: 2rem;
+}
+
+.update-header h2 {
+    margin: 0;
+    font-size: 1.5rem;
+    color: #fff;
+}
+
+.update-content {
+    color: #e0e0e0;
+    margin-bottom: 1.5rem;
+}
+
+.update-version {
+    font-size: 1.2rem;
+    font-weight: 600;
+    color: #9333ea;
+    margin-bottom: 0.5rem;
+}
+
+.current-version {
+    color: #888;
+    font-size: 0.9rem;
+    margin-bottom: 1rem;
+}
+
+.release-notes {
+    background: rgba(0, 0, 0, 0.3);
+    border-left: 3px solid #9333ea;
+    padding: 1rem;
+    border-radius: 8px;
+    max-height: 200px;
+    overflow-y: auto;
+    font-size: 0.9rem;
+    line-height: 1.6;
+}
+
+.update-progress {
+    margin-bottom: 1.5rem;
+}
+
+.progress-bar-container {
+    background: rgba(0, 0, 0, 0.3);
+    border-radius: 10px;
+    height: 20px;
+    overflow: hidden;
+    margin-bottom: 0.5rem;
+}
+
+.progress-bar {
+    height: 100%;
+    background: linear-gradient(90deg, #9333ea 0%, #7c3aed 100%);
+    width: 0%;
+    transition: width 0.3s ease;
+    border-radius: 10px;
+}
+
+.progress-text {
+    color: #aaa;
+    font-size: 0.9rem;
+    text-align: center;
+    margin: 0;
+}
+
+.update-note {
+    background: rgba(147, 51, 234, 0.1);
+    border: 1px solid rgba(147, 51, 234, 0.3);
+    padding: 0.75rem;
+    border-radius: 8px;
+    font-size: 0.9rem;
+    margin-top: 1rem;
+}
+
+.update-actions {
+    display: flex;
+    gap: 1rem;
+    justify-content: flex-end;
+}
+
+.update-actions button {
+    padding: 0.75rem 1.5rem;
+    border: none;
+    border-radius: 8px;
+    font-weight: 600;
+    cursor: pointer;
+    transition: all 0.2s;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+}
+
+.update-actions .btn-primary {
+    background: linear-gradient(135deg, #9333ea 0%, #7c3aed 100%);
+    color: white;
+}
+
+.update-actions .btn-primary:hover:not(:disabled) {
+    transform: translateY(-2px);
+    box-shadow: 0 5px 15px rgba(147, 51, 234, 0.4);
+}
+
+.update-actions .btn-secondary {
+    background: rgba(255, 255, 255, 0.1);
+    color: #e0e0e0;
+    border: 1px solid rgba(255, 255, 255, 0.2);
+}
+
+.update-actions .btn-secondary:hover:not(:disabled) {
+    background: rgba(255, 255, 255, 0.15);
+}
+
+.update-actions button:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
 }
diff --git a/PKGBUILD b/PKGBUILD
index 4f05e42..12f6707 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -29,5 +29,5 @@ package() {
   mkdir -p "$pkgdir/opt/$_pkgname"
   cp -r "$_pkgname/dist/linux-unpacked/"* "$pkgdir/opt/$_pkgname"
   install -Dm644 "$_pkgname.desktop" "$pkgdir/usr/share/applications/$_pkgname.desktop"
-  install -Dm644 "$_pkgname/icon.png" "$pkgdir/usr/share/icons/hicolor/512x512/apps/$_pkgname.png"
+  install -Dm644 "$_pkgname/GUI/icon.png" "$pkgdir/usr/share/icons/hicolor/256x256/apps/$_pkgname.png"
 }
diff --git a/backend/appUpdater.js b/backend/appUpdater.js
index 15a36ce..9a93636 100644
--- a/backend/appUpdater.js
+++ b/backend/appUpdater.js
@@ -15,12 +15,6 @@ class AppUpdater {
   }
 
   setupAutoUpdater() {
-    // Enable dev mode for testing (reads dev-app-update.yml)
-    // Only enable in development, not in production builds
-    if (process.env.NODE_ENV === 'development' || !app.isPackaged) {
-      autoUpdater.forceDevUpdateConfig = true;
-      console.log('Dev update mode enabled - using dev-app-update.yml');
-    }
 
     // Configure logger for electron-updater
     // Create a compatible logger interface
diff --git a/backend/managers/javaManager.js b/backend/managers/javaManager.js
index 84af570..0fb6f13 100644
--- a/backend/managers/javaManager.js
+++ b/backend/managers/javaManager.js
@@ -406,5 +406,6 @@ module.exports = {
   getJavaDetection,
   downloadJRE,
   extractJRE,
+  retryJREDownload,
   JAVA_EXECUTABLE
 };
diff --git a/backend/managers/modManager.js b/backend/managers/modManager.js
index 29580e6..7929e8a 100644
--- a/backend/managers/modManager.js
+++ b/backend/managers/modManager.js
@@ -6,7 +6,7 @@ const { getModsPath, getProfilesDir } = require('../core/paths');
 const { saveModsToConfig, loadModsFromConfig } = require('../core/config');
 const profileManager = require('./profileManager');
 
-const CF_API_KEY = "$2a$10$bqk254NMZOWVTzLVJCcxEOmhcyUujKxA5xk.kQCN9q0KNYFJd5b32";
+const API_KEY = "$2a$10$bqk254NMZOWVTzLVJCcxEOmhcyUujKxA5xk.kQCN9q0KNYFJd5b32";
 
 /**
  * Get the physical mods path for a specific profile.
@@ -120,7 +120,7 @@ async function downloadMod(modInfo) {
     if (!downloadUrl && modInfo.fileId && modInfo.modId) {
       const response = await axios.get(`https://api.curseforge.com/v1/mods/${modInfo.modId || modInfo.curseForgeId}/files/${modInfo.fileId || modInfo.curseForgeFileId}`, {
         headers: {
-          'x-api-key': modInfo.apiKey || CF_API_KEY,
+          'x-api-key': modInfo.apiKey || API_KEY,
           'Accept': 'application/json'
         }
       });
@@ -393,7 +393,7 @@ async function syncModsForCurrentProfile() {
                 ...mod,
                 modId: mod.curseForgeId,
                 fileId: mod.curseForgeFileId || mod.fileId,
-                apiKey: CF_API_KEY
+                apiKey: API_KEY
               });
             } catch (err) {
               console.error(`[ModManager] Auto-repair failed for "${mod.name}": ${err.message}`);
diff --git a/backend/utils/fileManager.js b/backend/utils/fileManager.js
index 972ca61..bad80b3 100644
--- a/backend/utils/fileManager.js
+++ b/backend/utils/fileManager.js
@@ -103,40 +103,36 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
       }
 
       const headers = {
-        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
-        'Accept': '*/*',
-        'Accept-Language': 'en-US,en;q=0.9',
-        'Referer': 'https://launcher.hytale.com/',
-        'Connection': 'keep-alive'
+        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36',
+        'Accept': '*/*'
       };
       
-      // Add Range header for resume capability
+      // Add Range header ONLY if resuming (startByte > 0)
       if (startByte > 0) {
         headers['Range'] = `bytes=${startByte}-`;
+        console.log(`Adding Range header: bytes=${startByte}-`);
+      } else {
+        console.log('Fresh download, no Range header');
       }
 
       const response = await axios({
         method: 'GET',
         url: url,
         responseType: 'stream',
-        timeout: 60000, // 60 secondes timeout
+        timeout: 60000,
         signal: controller.signal,
         headers: headers,
-        // Configuration Axios pour la robustesse réseau
         validateStatus: function (status) {
-          // Accept both 200 (full download) and 206 (partial content for resume)
           return (status >= 200 && status < 300) || status === 206;
         },
-        // Retry configuration
         maxRedirects: 5,
-        // Network resilience
-        family: 4 // Force IPv4
+        family: 4
       });
 
       const contentLength = response.headers['content-length'];
-      const totalSize = contentLength ? parseInt(contentLength, 10) + startByte : 0; // Adjust for resume
-      let downloaded = startByte; // Start with existing bytes
-      lastProgressTime = Date.now(); // Update time after response received
+      const totalSize = contentLength ? parseInt(contentLength, 10) + startByte : 0;
+      let downloaded = startByte;
+      lastProgressTime = Date.now();
       const startTime = Date.now();
 
       // Check network status before attempting download
@@ -344,8 +340,7 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
         });
       });
 
-      // Si on arrive ici, le téléchargement a réussi
-      return;
+      return dest;
 
   } catch (error) {
     lastError = error;
@@ -368,13 +363,16 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
       // If file is substantial size (> 1.5GB), treat as success and break
       if (sizeInMB >= 1500) {
         console.log('File appears to be complete despite error, treating as success');
-        return; // Exit the retry loop successfully
+        return dest; // Exit the retry loop successfully
       }
     }
 
     // Enhanced file cleanup with validation
     if (fs.existsSync(dest)) {
       try {
+        // HTTP 416 = Range Not Satisfiable, delete corrupted partial file
+        const isRangeError = error.message && error.message.includes('416');
+        
         // Check if file is corrupted (small or invalid) or if error is non-resumable
         const partialStats = fs.statSync(dest);
         const isResumableError = error.message && (
@@ -387,13 +385,14 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
         // Check if download appears to be complete (close to expected PWR size)
         const isPossiblyComplete = partialStats.size >= 1500 * 1024 * 1024; // >= 1.5GB
         
-        if (partialStats.size < 1024 * 1024 || (!isResumableError && !isPossiblyComplete)) {
-          // Delete if file is too small OR error is non-resumable AND not possibly complete
-          console.log(`[Cleanup] Removing PWR file (${!isResumableError && !isPossiblyComplete ? 'non-resumable error' : 'too small'}): ${(partialStats.size / 1024 / 1024).toFixed(2)} MB`);
+        if (isRangeError || partialStats.size < 1024 * 1024 || (!isResumableError && !isPossiblyComplete)) {
+          // Delete if HTTP 416 OR file is too small OR error is non-resumable AND not possibly complete
+          const reason = isRangeError ? 'HTTP 416 range error' : (!isResumableError && !isPossiblyComplete ? 'non-resumable error' : 'too small');
+          console.log(`[Cleanup] Removing file (${reason}): ${(partialStats.size / 1024 / 1024).toFixed(2)} MB`);
           fs.unlinkSync(dest);
         } else {
           // Keep the file for resume on resumable errors or if possibly complete
-          console.log(`[Resume] Keeping PWR file (${isPossiblyComplete ? 'possibly complete' : 'for resume'}): ${(partialStats.size / 1024 / 1024).toFixed(2)} MB`);
+          console.log(`[Resume] Keeping file (${isPossiblyComplete ? 'possibly complete' : 'for resume'}): ${(partialStats.size / 1024 / 1024).toFixed(2)} MB`);
         }
       } catch (cleanupError) {
         console.warn('Could not handle partial file:', cleanupError.message);
@@ -554,6 +553,17 @@ async function retryDownload(url, dest, progressCallback, previousError = null)
     fs.mkdirSync(destDir, { recursive: true });
   }
   
+  // CRITICAL: Delete partial file before manual retry to avoid HTTP 416
+  if (fs.existsSync(dest)) {
+    try {
+      const stats = fs.statSync(dest);
+      console.log(`[Retry] Deleting partial file before retry: ${(stats.size / 1024 / 1024).toFixed(2)} MB`);
+      fs.unlinkSync(dest);
+    } catch (err) {
+      console.warn('Could not delete partial file:', err.message);
+    }
+  }
+  
   try {
     await downloadFile(url, dest, progressCallback, additionalRetries);
     console.log('Manual retry successful');
diff --git a/icon.ico b/icon.ico
new file mode 100644
index 0000000..ded0e43
Binary files /dev/null and b/icon.ico differ
diff --git a/icon.png b/icon.png
new file mode 100644
index 0000000..61cff92
Binary files /dev/null and b/icon.png differ
diff --git a/main.js b/main.js
index 543a9c1..2a856ad 100644
--- a/main.js
+++ b/main.js
@@ -1,4 +1,5 @@
 const path = require('path');
+require('dotenv').config({ path: path.join(__dirname, '.env') });
 const { app, BrowserWindow, ipcMain, dialog, shell } = require('electron');
 const { autoUpdater } = require('electron-updater');
 const fs = require('fs');
@@ -446,6 +447,13 @@ ipcMain.handle('launch-game', async (event, playerName, javaPath, installPath, g
 
 ipcMain.handle('install-game', async (event, playerName, javaPath, installPath, branch) => {
   try {
+    console.log(`[IPC] install-game called with parameters:`);
+    console.log(`  - playerName: ${playerName}`);
+    console.log(`  - javaPath: ${javaPath}`);
+    console.log(`  - installPath: ${installPath}`);
+    console.log(`  - branch: ${branch}`);
+    console.log(`[IPC] branch type: ${typeof branch}, value: ${JSON.stringify(branch)}`);
+    
     // Signal installation start
     if (mainWindow && !mainWindow.isDestroyed()) {
       mainWindow.webContents.send('installation-start');
@@ -625,6 +633,7 @@ ipcMain.handle('load-close-launcher', () => {
 });
 
 ipcMain.handle('select-install-path', async () => {
+
   const result = await dialog.showOpenDialog(mainWindow, {
     properties: ['openDirectory'],
     title: 'Select Installation Folder'
@@ -742,8 +751,8 @@ ipcMain.handle('retry-download', async (event, retryData) => {
       console.log('[IPC] Full JRE retry data:', JSON.stringify(retryData, null, 2));
       
       const { retryJREDownload } = require('./backend/managers/javaManager');
-      await retryJREDownload(retryData.jreUrl, jreCacheFile, progressCallback);
       const jreCacheFile = path.join(retryData.cacheDir, retryData.fileName);
+      await retryJREDownload(retryData.jreUrl, jreCacheFile, progressCallback);
       
       return { success: true };
     }
@@ -930,6 +939,10 @@ ipcMain.handle('get-local-app-data', async () => {
   return process.env.LOCALAPPDATA || path.join(os.homedir(), 'AppData', 'Local');
 });
 
+ipcMain.handle('get-env-var', async (event, key) => {
+  return process.env[key];
+});
+
 ipcMain.handle('get-user-id', async () => {
   try {
     const { getOrCreatePlayerId } = require('./backend/launcher');
diff --git a/package.json b/package.json
index e097c84..1b1fcf7 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
     "adm-zip": "^0.5.10",
     "axios": "^1.6.0",
     "discord-rpc": "^4.0.1",
+    "dotenv": "^17.2.3",
     "electron-updater": "^6.7.3",
     "fs-extra": "^11.3.3",
     "tar": "^6.2.1",
@@ -68,7 +69,8 @@
       "preload.js",
       "backend/**/*",
       "GUI/**/*",
-      "package.json"
+      "package.json",
+      ".env"
     ],
     "win": {
       "target": [
@@ -80,7 +82,7 @@
           ]
         }
       ],
-      "icon": "build/icon.ico"
+      "icon": "icon.ico"
     },
     "linux": {
       "target": [
diff --git a/preload.js b/preload.js
index 330c0fc..0cd9091 100644
--- a/preload.js
+++ b/preload.js
@@ -35,6 +35,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   openGameLocation: () => ipcRenderer.invoke('open-game-location'),
   saveSettings: (settings) => ipcRenderer.invoke('save-settings', settings),
   loadSettings: () => ipcRenderer.invoke('load-settings'),
+  getEnvVar: (key) => ipcRenderer.invoke('get-env-var', key),
   getLocalAppData: () => ipcRenderer.invoke('get-local-app-data'),
   getModsPath: () => ipcRenderer.invoke('get-mods-path'),
   loadInstalledMods: (modsPath) => ipcRenderer.invoke('load-installed-mods', modsPath),
@@ -129,5 +130,8 @@ contextBridge.exposeInMainWorld('electronAPI', {
   },
   onUpdateDownloaded: (callback) => {
     ipcRenderer.on('update-downloaded', (event, data) => callback(data));
+  },
+  onUpdateError: (callback) => {
+    ipcRenderer.on('update-error', (event, data) => callback(data));
   }
 });