diff --git a/backend/core/testConfig.js b/backend/core/testConfig.js
index e6e9687..0229dda 100644
--- a/backend/core/testConfig.js
+++ b/backend/core/testConfig.js
@@ -1,5 +1,5 @@
 const FORCE_CLEAN_INSTALL_VERSION = false;
-const CLEAN_INSTALL_TEST_VERSION = '4.pwr';
+const CLEAN_INSTALL_TEST_VERSION = 'v4';
 
 module.exports = {
   FORCE_CLEAN_INSTALL_VERSION,
diff --git a/backend/managers/gameManager.js b/backend/managers/gameManager.js
index 98753d3..c60e912 100644
--- a/backend/managers/gameManager.js
+++ b/backend/managers/gameManager.js
@@ -64,7 +64,7 @@ async function safeRemoveDirectory(dirPath, maxRetries = 3) {
   }
 }
 
-async function downloadPWR(branch = 'release', fileName = '7.pwr', progressCallback, cacheDir = CACHE_DIR, manualRetry = false) {
+async function downloadPWR(branch = 'release', fileName = 'v8', progressCallback, cacheDir = CACHE_DIR, manualRetry = false) {
   const osName = getOS();
   const arch = getArch();
 
@@ -72,8 +72,23 @@ async function downloadPWR(branch = 'release', fileName = '7.pwr', progressCallb
     throw new Error('Hytale x86_64 Intel Mac Support has not been released yet. Please check back later.');
   }
 
-  const url = `https://game-patches.hytale.com/patches/${osName}/${arch}/${branch}/0/${fileName}`;
-  const dest = path.join(cacheDir, `${branch}_${fileName}`);
+  const { getPWRUrlFromNewAPI } = require('../services/versionManager');
+  
+  let url;
+  let isUsingNewAPI = false;
+  
+  try {
+    console.log(`[DownloadPWR] Fetching URL from new API for branch: ${branch}, version: ${fileName}`);
+    url = await getPWRUrlFromNewAPI(branch, fileName);
+    isUsingNewAPI = true;
+    console.log(`[DownloadPWR] Using new API URL: ${url}`);
+  } catch (error) {
+    console.error(`[DownloadPWR] Failed to get URL from new API: ${error.message}`);
+    console.log(`[DownloadPWR] Falling back to old URL format`);
+    url = `https://game-patches.hytale.com/patches/${osName}/${arch}/${branch}/0/${fileName}.pwr`;
+  }
+  
+  const dest = path.join(cacheDir, `${branch}_${fileName}.pwr`);
 
   // Check if file exists and validate it
   if (fs.existsSync(dest) && !manualRetry) {
@@ -93,7 +108,7 @@ async function downloadPWR(branch = 'release', fileName = '7.pwr', progressCallb
     }
   }
 
-  console.log('Fetching PWR patch file:', url);
+  console.log(`Fetching PWR patch file from ${isUsingNewAPI ? 'NEW API' : 'old API'}:`, url);
   
   try {
     if (manualRetry) {
diff --git a/backend/services/versionManager.js b/backend/services/versionManager.js
index f739122..1b42b9b 100644
--- a/backend/services/versionManager.js
+++ b/backend/services/versionManager.js
@@ -6,32 +6,186 @@ const { smartRequest } = require('../utils/proxyClient');
 
 const BASE_PATCH_URL = 'https://game-patches.hytale.com/patches';
 const MANIFEST_API = 'https://files.hytalef2p.com/api/patch_manifest';
+const NEW_API_URL = 'https://thecute.cloud/ShipOfYarn/api.php';
 
-async function getLatestClientVersion(branch = 'release') {
+let apiCache = null;
+let apiCacheTime = 0;
+const API_CACHE_DURATION = 60000; // 1 minute
+
+async function fetchNewAPI() {
+  const now = Date.now();
+  
+  if (apiCache && (now - apiCacheTime) < API_CACHE_DURATION) {
+    console.log('[NewAPI] Using cached API data');
+    return apiCache;
+  }
+  
   try {
-    console.log(`Fetching latest client version from API (branch: ${branch})...`);
-    const response = await smartRequest(`https://files.hytalef2p.com/api/version_client?branch=${branch}`, {
-      timeout: 40000,
+    console.log('[NewAPI] Fetching from:', NEW_API_URL);
+    const response = await axios.get(NEW_API_URL, {
+      timeout: 15000,
       headers: {
         'User-Agent': 'Hytale-F2P-Launcher'
       }
     });
-
-    if (response.data && response.data.client_version) {
-      const version = response.data.client_version;
-      console.log(`Latest client version for ${branch}: ${version}`);
-      return version;
+    
+    if (response.data && response.data.hytale) {
+      apiCache = response.data;
+      apiCacheTime = now;
+      console.log('[NewAPI] API data fetched and cached successfully');
+      return response.data;
     } else {
-      console.log('Warning: Invalid API response, falling back to latest known version (7.pwr)');
-      return '7.pwr';
+      throw new Error('Invalid API response structure');
     }
   } catch (error) {
-    console.error('Error fetching client version:', error.message);
-    console.log('Warning: API unavailable, falling back to latest known version (7.pwr)');
-    return '7.pwr';
+    console.error('[NewAPI] Error fetching API:', error.message);
+    if (apiCache) {
+      console.log('[NewAPI] Using expired cache due to error');
+      return apiCache;
+    }
+    throw error;
   }
 }
 
+async function getLatestVersionFromNewAPI(branch = 'release') {
+  try {
+    const apiData = await fetchNewAPI();
+    const osName = getOS();
+    const arch = getArch();
+    
+    let osKey = osName;
+    if (osName === 'darwin') {
+      osKey = 'mac';
+    }
+    
+    const branchData = apiData.hytale[branch];
+    if (!branchData || !branchData[osKey]) {
+      throw new Error(`No data found for branch: ${branch}, OS: ${osKey}`);
+    }
+    
+    const osData = branchData[osKey];
+    
+    const versions = Object.keys(osData).filter(key => key.endsWith('.pwr'));
+    
+    if (versions.length === 0) {
+      throw new Error(`No .pwr files found for ${osKey}`);
+    }
+    
+    const versionNumbers = versions.map(v => {
+      const match = v.match(/v(\d+)/);
+      return match ? parseInt(match[1]) : 0;
+    });
+    
+    const latestVersionNumber = Math.max(...versionNumbers);
+    console.log(`[NewAPI] Latest version number: ${latestVersionNumber} for branch ${branch}`);
+    
+    return `v${latestVersionNumber}`;
+  } catch (error) {
+    console.error('[NewAPI] Error getting latest version:', error.message);
+    throw error;
+  }
+}
+
+async function getPWRUrlFromNewAPI(branch = 'release', version = 'v8') {
+  try {
+    const apiData = await fetchNewAPI();
+    const osName = getOS();
+    const arch = getArch();
+    
+    let osKey = osName;
+    if (osName === 'darwin') {
+      osKey = 'mac';
+    }
+    
+    let fileName;
+    if (osName === 'windows') {
+      fileName = `${version}-windows-amd64.pwr`;
+    } else if (osName === 'linux') {
+      fileName = `${version}-linux-amd64.pwr`;
+    } else if (osName === 'darwin') {
+      fileName = `${version}-darwin-arm64.pwr`;
+    }
+    
+    const branchData = apiData.hytale[branch];
+    if (!branchData || !branchData[osKey]) {
+      throw new Error(`No data found for branch: ${branch}, OS: ${osKey}`);
+    }
+    
+    const osData = branchData[osKey];
+    const url = osData[fileName];
+    
+    if (!url) {
+      throw new Error(`No URL found for ${fileName}`);
+    }
+    
+    console.log(`[NewAPI] URL for ${fileName}: ${url}`);
+    return url;
+  } catch (error) {
+    console.error('[NewAPI] Error getting PWR URL:', error.message);
+    throw error;
+  }
+}
+
+async function getLatestClientVersion(branch = 'release') {
+  try {
+    console.log(`[NewAPI] Fetching latest client version from new API (branch: ${branch})...`);
+    
+    // Utiliser la nouvelle API
+    const latestVersion = await getLatestVersionFromNewAPI(branch);
+    console.log(`[NewAPI] Latest client version for ${branch}: ${latestVersion}`);
+    return latestVersion;
+    
+  } catch (error) {
+    console.error('[NewAPI] Error fetching client version from new API:', error.message);
+    console.log('[NewAPI] Falling back to old API...');
+    
+    // Fallback vers l'ancienne API si la nouvelle échoue
+    try {
+      const response = await smartRequest(`https://files.hytalef2p.com/api/version_client?branch=${branch}`, {
+        timeout: 40000,
+        headers: {
+          'User-Agent': 'Hytale-F2P-Launcher'
+        }
+      });
+
+      if (response.data && response.data.client_version) {
+        const version = response.data.client_version;
+        console.log(`Latest client version for ${branch} (old API): ${version}`);
+        return version;
+      } else {
+        console.log('Warning: Invalid API response, falling back to latest known version (v8)');
+        return 'v8';
+      }
+    } catch (fallbackError) {
+      console.error('Error fetching client version from old API:', fallbackError.message);
+      console.log('Warning: Both APIs unavailable, falling back to latest known version (v8)');
+      return 'v8';
+    }
+  }
+}
+
+// Fonction utilitaire pour extraire le numéro de version
+// Supporte les formats: "7.pwr", "v8", "v8-windows-amd64.pwr", etc.
+function extractVersionNumber(version) {
+  if (!version) return 0;
+  
+  // Nouveau format: "v8" ou "v8-xxx.pwr"
+  const vMatch = version.match(/v(\d+)/);
+  if (vMatch) {
+    return parseInt(vMatch[1]);
+  }
+  
+  // Ancien format: "7.pwr"
+  const pwrMatch = version.match(/(\d+)\.pwr/);
+  if (pwrMatch) {
+    return parseInt(pwrMatch[1]);
+  }
+  
+  // Fallback: essayer de parser directement
+  const num = parseInt(version);
+  return isNaN(num) ? 0 : num;
+}
+
 function buildArchiveUrl(buildNumber, branch = 'release') {
   const os = getOS();
   const arch = getArch();
@@ -50,7 +204,7 @@ async function checkArchiveExists(buildNumber, branch = 'release') {
 
 async function discoverAvailableVersions(latestKnown, branch = 'release', maxProbe = 50) {
   const available = [];
-  const latest = parseInt(latestKnown.replace('.pwr', ''));
+  const latest = extractVersionNumber(latestKnown);
   
   for (let i = latest; i >= Math.max(1, latest - maxProbe); i--) {
     const exists = await checkArchiveExists(i, branch);
@@ -77,7 +231,7 @@ async function fetchPatchManifest(branch = 'release') {
 }
 
 async function extractVersionDetails(targetVersion, branch = 'release') {
-  const buildNumber = parseInt(targetVersion.replace('.pwr', ''));
+  const buildNumber = extractVersionNumber(targetVersion);
   const previousBuild = buildNumber - 1;
   
   const manifest = await fetchPatchManifest(branch);
@@ -103,8 +257,8 @@ function canUseDifferentialUpdate(currentVersion, targetDetails) {
   
   if (!currentVersion) return false;
   
-  const currentBuild = parseInt(currentVersion.replace('.pwr', ''));
-  const expectedSource = parseInt(targetDetails.sourceVersion?.replace('.pwr', '') || '0');
+  const currentBuild = extractVersionNumber(currentVersion);
+  const expectedSource = extractVersionNumber(targetDetails.sourceVersion);
   
   return currentBuild === expectedSource;
 }
@@ -112,8 +266,8 @@ function canUseDifferentialUpdate(currentVersion, targetDetails) {
 function needsIntermediatePatches(currentVersion, targetVersion) {
   if (!currentVersion) return [];
   
-  const current = parseInt(currentVersion.replace('.pwr', ''));
-  const target = parseInt(targetVersion.replace('.pwr', ''));
+  const current = extractVersionNumber(currentVersion);
+  const target = extractVersionNumber(targetVersion);
   
   const intermediates = [];
   for (let i = current + 1; i <= target; i++) {
@@ -160,5 +314,9 @@ module.exports = {
   needsIntermediatePatches,
   computeFileChecksum,
   validateChecksum,
-  getInstalledClientVersion
+  getInstalledClientVersion,
+  fetchNewAPI,
+  getLatestVersionFromNewAPI,
+  getPWRUrlFromNewAPI,
+  extractVersionNumber
 };
diff --git a/main.js b/main.js
index 39975e4..265052f 100644
--- a/main.js
+++ b/main.js
@@ -627,7 +627,7 @@ ipcMain.handle('install-game', async (event, playerName, javaPath, installPath,
       console.log('[Main] Processing Butler error with retry context');
       errorData.retryData = {
         branch: error.branch || 'release',
-        fileName: error.fileName || '7.pwr',
+        fileName: error.fileName || 'v8',
         cacheDir: error.cacheDir
       };
       errorData.canRetry = error.canRetry !== false;
@@ -647,7 +647,7 @@ ipcMain.handle('install-game', async (event, playerName, javaPath, installPath,
       console.log('[Main] Processing generic error, creating default retry data');
       errorData.retryData = {
         branch: 'release',
-        fileName: '7.pwr'
+        fileName: 'v8'
       };
       // For generic errors, assume it's retryable unless specified
       errorData.canRetry = error.canRetry !== false;
@@ -887,7 +887,7 @@ ipcMain.handle('retry-download', async (event, retryData) => {
       console.log('[IPC] Invalid retry data, using PWR defaults');
       retryData = {
         branch: 'release',
-        fileName: '7.pwr'
+        fileName: 'v8'
       };
     }
 
@@ -921,7 +921,7 @@ ipcMain.handle('retry-download', async (event, retryData) => {
         } :
         {
           branch: retryData?.branch || 'release',
-          fileName: retryData?.fileName || '7.pwr',
+          fileName: retryData?.fileName || 'v8',
           cacheDir: retryData?.cacheDir
         };