diff --git a/electron/main.js b/electron/main.js
index a853766..b0d46be 100644
--- a/electron/main.js
+++ b/electron/main.js
@@ -24,6 +24,7 @@ function setupAutoUpdater() {
 
   autoUpdater.on('update-available', () => {
     console.log('[AutoUpdater] Update available, downloading...');
+    if (mainWindow) mainWindow.webContents.send('update-available');
   });
 
   autoUpdater.on('update-downloaded', (_event, releaseNotes, releaseName) => {
@@ -42,6 +43,7 @@ function setupAutoUpdater() {
 
   autoUpdater.on('error', (err) => {
     console.error('[AutoUpdater] Error:', err.message);
+    if (mainWindow) mainWindow.webContents.send('update-error', err.message);
   });
 
   // Check for updates after 5 seconds, then every 30 minutes
diff --git a/electron/preload.js b/electron/preload.js
index 4c37118..c64bfe1 100644
--- a/electron/preload.js
+++ b/electron/preload.js
@@ -5,6 +5,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   version: '1.5.0',
   onUpdateAvailable: (callback) => ipcRenderer.on('update-available', callback),
   onUpdateReady: (callback) => ipcRenderer.on('update-ready', callback),
+  onUpdateError: (callback) => ipcRenderer.on('update-error', (_e, msg) => callback(msg)),
   installUpdate: () => ipcRenderer.send('install-update'),
   setStreaming: (active) => ipcRenderer.send('streaming-status', active),
 });
diff --git a/web/src/App.tsx b/web/src/App.tsx
index 85b43f2..f024d8d 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -27,7 +27,7 @@ export function registerTab(pluginName: string, component: React.FC<{ data: any
 export default function App() {
   const [connected, setConnected] = useState(false);
   const [plugins, setPlugins] = useState<PluginInfo[]>([]);
-  const [updateReady, setUpdateReady] = useState(false);
+  const [updateState, setUpdateState] = useState<'idle' | 'downloading' | 'ready' | 'error'>('idle');
   const [activeTab, setActiveTabRaw] = useState<string>(() => localStorage.getItem('hub_activeTab') ?? '');
 
   const setActiveTab = (tab: string) => {
@@ -97,8 +97,10 @@ export default function App() {
   // Listen for Electron auto-update events
   useEffect(() => {
     const api = (window as any).electronAPI;
-    if (!api?.onUpdateReady) return;
-    api.onUpdateReady(() => setUpdateReady(true));
+    if (!api?.onUpdateAvailable) return;
+    api.onUpdateAvailable(() => setUpdateState('downloading'));
+    api.onUpdateReady(() => setUpdateState('ready'));
+    api.onUpdateError?.(() => setUpdateState('error'));
   }, []);
 
   // Tab icon mapping
@@ -153,12 +155,40 @@ export default function App() {
         </div>
       </header>
 
-      {updateReady && (
-        <div className="hub-update-bar">
-          <span>Neues Update verfügbar!</span>
-          <button onClick={() => (window as any).electronAPI?.installUpdate()}>
-            Jetzt neu starten
-          </button>
+      {updateState !== 'idle' && (
+        <div className="hub-update-overlay">
+          <div className="hub-update-modal">
+            {updateState === 'downloading' && (
+              <>
+                <div className="hub-update-icon">{'\u2B07\uFE0F'}</div>
+                <h2>Update verfügbar</h2>
+                <p>Update wird heruntergeladen...</p>
+                <div className="hub-update-progress">
+                  <div className="hub-update-progress-bar" />
+                </div>
+              </>
+            )}
+            {updateState === 'ready' && (
+              <>
+                <div className="hub-update-icon">{'\u2705'}</div>
+                <h2>Update bereit!</h2>
+                <p>Die App wird neu gestartet, um das Update zu installieren.</p>
+                <button className="hub-update-btn" onClick={() => (window as any).electronAPI?.installUpdate()}>
+                  OK
+                </button>
+              </>
+            )}
+            {updateState === 'error' && (
+              <>
+                <div className="hub-update-icon">{'\u274C'}</div>
+                <h2>Update fehlgeschlagen</h2>
+                <p>Das Update konnte nicht heruntergeladen werden.</p>
+                <button className="hub-update-btn" onClick={() => setUpdateState('idle')}>
+                  Schließen
+                </button>
+              </>
+            )}
+          </div>
         </div>
       )}
 
diff --git a/web/src/styles.css b/web/src/styles.css
index ed5bd67..f5eecd7 100644
--- a/web/src/styles.css
+++ b/web/src/styles.css
@@ -226,22 +226,61 @@ html, body {
   border-radius: 4px;
 }
 
-/* ── Update Banner ── */
-.hub-update-bar {
+/* ── Update Modal ── */
+.hub-update-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 9999;
   display: flex;
   align-items: center;
   justify-content: center;
-  gap: 12px;
-  padding: 8px 16px;
-  background: rgba(var(--accent-rgb), 0.15);
-  border-bottom: 1px solid rgba(var(--accent-rgb), 0.3);
-  font-size: 13px;
-  font-weight: 500;
-  color: var(--accent);
+  background: rgba(0, 0, 0, 0.7);
+  backdrop-filter: blur(4px);
 }
-.hub-update-bar button {
-  padding: 4px 14px;
-  font-size: 12px;
+.hub-update-modal {
+  background: var(--bg-card);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 32px 40px;
+  text-align: center;
+  min-width: 320px;
+  max-width: 400px;
+  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
+}
+.hub-update-icon {
+  font-size: 40px;
+  margin-bottom: 12px;
+}
+.hub-update-modal h2 {
+  margin: 0 0 8px;
+  font-size: 18px;
+  color: var(--text-primary);
+}
+.hub-update-modal p {
+  margin: 0 0 20px;
+  font-size: 14px;
+  color: var(--text-secondary);
+}
+.hub-update-progress {
+  height: 4px;
+  border-radius: 2px;
+  background: var(--bg-deep);
+  overflow: hidden;
+}
+.hub-update-progress-bar {
+  height: 100%;
+  width: 40%;
+  border-radius: 2px;
+  background: var(--accent);
+  animation: hub-update-slide 1.5s ease-in-out infinite;
+}
+@keyframes hub-update-slide {
+  0% { transform: translateX(-100%); }
+  100% { transform: translateX(350%); }
+}
+.hub-update-btn {
+  padding: 8px 32px;
+  font-size: 14px;
   font-weight: 600;
   border: none;
   border-radius: var(--radius);
@@ -250,7 +289,7 @@ html, body {
   cursor: pointer;
   transition: opacity var(--transition);
 }
-.hub-update-bar button:hover {
+.hub-update-btn:hover {
   opacity: 0.85;
 }