fix: JRE retry button

backend/managers/gameManager.js

@@ -520,9 +520,17 @@ async function installGame(playerName = 'Player', progressCallback, javaPathOver
     try {
       await downloadJRE(progressCallback, customCacheDir, customJreDir);
     } catch (error) {
+      // Don't immediately fall back to system Java for JRE download errors - let user retry
+      if (error.isJREError) {
+        console.error('[Install] JRE download failed, allowing user retry:', error.message);
+        throw error; // Re-throw JRE errors to trigger retry UI
+      }
+      
+      // For non-download JRE errors, fall back to system Java
       const fallback = await detectSystemJava();
       if (fallback) {
         javaBin = fallback;
+        console.log('[Install] Using system Java as fallback');
       } else {
         throw error;
       }

backend/managers/javaManager.js

@@ -9,7 +9,7 @@ const tar = require('tar');
 const { expandHome, JRE_DIR } = require('../core/paths');
 const { getOS, getArch } = require('../utils/platformUtils');
 const { loadConfig } = require('../core/config');
-const { downloadFile } = require('../utils/fileManager');
+const { downloadFile, retryDownload } = require('../utils/fileManager');
 
 const execFileAsync = promisify(execFile);
 const JAVA_EXECUTABLE = 'java' + (process.platform === 'win32' ? '.exe' : '');
@@ -188,6 +188,20 @@ async function getJavaDetection() {
   };
 }
 
+// Manual retry function for JRE downloads
+async function retryJREDownload(url, cacheFile, progressCallback) {
+  console.log('Initiating manual JRE retry...');
+  
+  // Ensure cache directory exists before retrying
+  const cacheDir = path.dirname(cacheFile);
+  if (!fs.existsSync(cacheDir)) {
+    console.log('Creating JRE cache directory:', cacheDir);
+    fs.mkdirSync(cacheDir, { recursive: true });
+  }
+  
+  return await retryDownload(url, cacheFile, progressCallback);
+}
+
 async function downloadJRE(progressCallback, cacheDir, jreDir = JRE_DIR) {
   if (!fs.existsSync(cacheDir)) {
     fs.mkdirSync(cacheDir, { recursive: true });
@@ -230,7 +244,40 @@ async function downloadJRE(progressCallback, cacheDir, jreDir = JRE_DIR) {
       progressCallback('Fetching Java runtime...', null, null, null, null);
     }
     console.log('Fetching Java runtime...');
-    await downloadFile(platform.url, cacheFile, progressCallback);
+    let jreFile;
+    try {
+      jreFile = await downloadFile(platform.url, cacheFile, progressCallback);
+      
+      // If downloadFile returns false or undefined, it means the download failed
+      // We should retry the download with a manual retry
+      if (!jreFile || typeof jreFile !== 'string') {
+        console.log('[JRE Download] JRE file download failed or incomplete, attempting retry...');
+        jreFile = await retryJREDownload(platform.url, cacheFile, progressCallback);
+      }
+      
+      // Double-check we have a valid file
+      if (!jreFile || typeof jreFile !== 'string') {
+        throw new Error(`JRE download failed: received invalid path ${jreFile}. Please retry download.`);
+      }
+      
+    } catch (downloadError) {
+      console.error('[JRE Download] JRE download failed:', downloadError.message);
+      
+      // Enhance error with retry information for the UI
+      const enhancedError = new Error(`JRE download failed: ${downloadError.message}`);
+      enhancedError.originalError = downloadError;
+      enhancedError.canRetry = downloadError.isConnectionLost ? false : (downloadError.canRetry !== false);
+      enhancedError.jreUrl = platform.url;
+      enhancedError.jreDest = cacheFile;
+      enhancedError.osName = osName;
+      enhancedError.arch = arch;
+      enhancedError.fileName = fileName;
+      enhancedError.cacheDir = cacheDir;
+      enhancedError.isJREError = true; // Flag to identify JRE errors
+      enhancedError.isConnectionLost = downloadError.isConnectionLost || false;
+      
+      throw enhancedError;
+    }
     console.log('Download finished');
   }
 

backend/utils/fileManager.js

@@ -423,7 +423,8 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
     const canRetry = (error.canRetry === false) ? false : isRetryable;
 
     if (!canRetry || attempt === maxRetries - 1) {
-      retryState.canRetry = false;
+      // Don't set retryState.canRetry to false for max retries - user should still be able to retry manually
+      retryState.canRetry = error.canRetry === false ? false : true;
       console.error(`Non-retryable error or max retries reached: ${error.code || error.message}`);
       break;
     }
@@ -439,6 +440,9 @@ async function downloadFile(url, dest, progressCallback, maxRetries = 5) {
   enhancedError.retryState = retryState;
   enhancedError.lastError = lastError;
   enhancedError.detailedError = detailedError;
+  
+  // Allow manual retry unless it's a connection lost error
+  enhancedError.canRetry = !lastError?.isConnectionLost && lastError?.canRetry !== false;
   throw enhancedError;
 }
 
@@ -543,6 +547,13 @@ async function retryDownload(url, dest, progressCallback, previousError = null)
     additionalRetries = Math.max(2, 5 - previousError.retryState.attempts);
   }
   
+  // Ensure cache directory exists before retrying
+  const destDir = path.dirname(dest);
+  if (!fs.existsSync(destDir)) {
+    console.log('Creating cache directory:', destDir);
+    fs.mkdirSync(destDir, { recursive: true });
+  }
+  
   try {
     await downloadFile(url, dest, progressCallback, additionalRetries);
     console.log('Manual retry successful');