diff --git a/static/app.js b/static/app.js
index 59936b1..c00a7ed 100644
--- a/static/app.js
+++ b/static/app.js
@@ -572,9 +572,18 @@ window.addEventListener('beforeinstallprompt', (e) => {
 
 document.addEventListener('click', async (e) => {
   if (!e.target.closest('#btn-install')) return;
-  if (!deferredInstall) return;
-  deferredInstall.prompt();
-  await deferredInstall.userChoice;
-  deferredInstall = null;
-  $('#btn-install').hidden = true;
+  if (!deferredInstall) {
+    banner("No install prompt available — try Chrome's own menu (⋮ → Install app) instead.", true);
+    return;
+  }
+  try {
+    await deferredInstall.prompt();
+    const choice = await deferredInstall.userChoice;
+    if (choice.outcome !== 'accepted') banner(`Install ${choice.outcome}.`);
+  } catch (err) {
+    banner(`Install failed: ${err.message}`, true);
+  } finally {
+    deferredInstall = null;
+    $('#btn-install').hidden = true;
+  }
 });