diff --git a/src/main/index.ts b/src/main/index.ts
index d3ae1c7..fcf4955 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -1,6 +1,7 @@
 import { app, BrowserWindow, Menu, clipboard, ipcMain, safeStorage, session, shell } from 'electron';
 import { join, dirname } from 'path';
-import { existsSync, mkdirSync, unlinkSync, promises as fsp } from 'fs';
+import { existsSync, mkdirSync, promises as fsp } from 'fs';
+import { existsSync as origExistsSync, unlinkSync as origUnlinkSync } from 'original-fs';
 import { get as httpsGet } from 'https';
 import { execFile } from 'child_process';
 import * as os from 'os';
@@ -179,8 +180,8 @@ app.whenReady().then(async () => {
     // Clean up stale pending asar from a previous failed swap
     const resourcesDir = join(dirname(app.getPath('exe')), 'resources');
     const stalePending = join(resourcesDir, 'app-pending.asar');
-    if (existsSync(stalePending)) {
-      try { unlinkSync(stalePending); } catch { /* ignore */ }
+    if (origExistsSync(stalePending)) {
+      try { origUnlinkSync(stalePending); } catch { /* ignore */ }
     }
 
     try {
@@ -213,8 +214,8 @@ app.whenReady().then(async () => {
           } catch (err) {
             electronLog.error('[KCC] Patch download failed:', err);
             // Clean up failed download
-            if (existsSync(pendingPath)) {
-              try { unlinkSync(pendingPath); } catch { /* ignore */ }
+            if (origExistsSync(pendingPath)) {
+              try { origUnlinkSync(pendingPath); } catch { /* ignore */ }
             }
             if (!updateWin.isDestroyed()) updateWin.close();
           }
diff --git a/src/main/updater.ts b/src/main/updater.ts
index 5d66ae8..36698e6 100644
--- a/src/main/updater.ts
+++ b/src/main/updater.ts
@@ -1,5 +1,7 @@
 import { get as httpsGet } from 'https';
-import { createReadStream, createWriteStream, writeFileSync, renameSync, unlinkSync, existsSync, mkdirSync } from 'fs';
+// Use original-fs to bypass Electron's asar interception — required for
+// writing/renaming .asar files in the resources directory.
+import { createReadStream, createWriteStream, writeFileSync, renameSync, unlinkSync, existsSync, mkdirSync } from 'original-fs';
 import { join, dirname } from 'path';
 import { createHash } from 'crypto';
 import { spawn } from 'child_process';
diff --git a/vite.main.config.ts b/vite.main.config.ts
index 629089b..8a7d6bf 100644
--- a/vite.main.config.ts
+++ b/vite.main.config.ts
@@ -20,7 +20,7 @@ export default defineConfig({
     outDir: 'dist/main',
     emptyDirBefore: true,
     rollupOptions: {
-      external: ['electron', 'electron-store', ...nodeBuiltins],
+      external: ['electron', 'electron-store', 'original-fs', ...nodeBuiltins],
     },
     target: 'node20',
     minify: isProd,