fix(autoUpdate): improve error handling and UI reset during update process

app/autoUpdater.js

@@ -112,6 +112,7 @@ function initAutoUpdater(mainWindow) {
     }
 
     logger.error("Auto update error:", err);
+    mainWindow?.webContents.send("update-error", msg);
   });
 
   checkForUpdates();
@@ -122,6 +123,8 @@ function initAutoUpdater(mainWindow) {
  * Separated from init for reusability and testability.
  */
 async function checkForUpdates() {
+
+  // If app is was installed from SNAP or Flatpak.
   if (process.env.SNAP || process.env.FLATPAK_ID) return;
   if (!require("electron").app.isPackaged) return;
 
@@ -141,6 +144,7 @@ async function downloadUpdate() {
     await autoUpdater.downloadUpdate();
   } catch (err) {
     logger.error("Download failed:", err.message);
+    throw err;
   }
 }
 

preload.js

@@ -122,10 +122,19 @@ contextBridge.exposeInMainWorld("electronAPI", {
    */
   installUpdate: () => ipcRenderer.invoke("install-update"),
 
+  /**
+   * Subscribes to the update error event.
+   *
+   * @param {Function} callback - Function executed with error information when an update error occurs.
+   * @returns {Electron.IpcRenderer}
+   */
+  onUpdateError: (callback) => ipcRenderer.on("update-error", (_, err) => callback(err)),
+
   /**
    * Subscribes to the download progress event.
    *
    * @param {Function} callback - Function executed with progress metrics (percent, bytesPerSecond, transferred, total).
+   * @returns {Electron.IpcRenderer}
    */
   onDownloadProgress: (callback) =>
     ipcRenderer.on("update-progress", (_, progress) => callback(progress)),

public/script/autoUpdate.js

@@ -50,6 +50,23 @@ async function initUpdateUI() {
     const initialTitleText = title.textContent;
     const initialSubText = sub.textContent;
 
+    const resetUI = () => {
+      btn.disabled = false;
+      btn.textContent = initialButtonText;
+      icon.textContent = initialIconText;
+      title.textContent = initialTitleText;
+      sub.textContent = initialSubText;
+      progressWrap.style.display = "none";
+      progressFill.style.width = "0%";
+      progressPct.textContent = "0%";
+      progressEta.textContent = "";
+    };
+
+    window.electronAPI.onUpdateError((err) => {
+      console.error("Update failed asynchronously:", err);
+      resetUI();
+    });
+
     btn.onclick = async () => {
 
       btn.disabled = true;
@@ -61,15 +78,7 @@ async function initUpdateUI() {
       try {
         await window.electronAPI.downloadUpdate();
       } catch {
-        btn.disabled = false;
-        btn.textContent = initialButtonText;
-        icon.textContent = initialIconText;
-        title.textContent = initialTitleText;
-        sub.textContent = initialSubText;
-        progressWrap.style.display = "none";
-        progressFill.style.width = "0%";
-        progressPct.textContent = "0%";
-        progressEta.textContent = "";
+        resetUI();
       }
     };