Windows desktop: repeated "TypeError: h.setProgressBar is not a function" dialog when saving/downloading files

Description

On the ChatGPT/Codex Windows desktop app, any operation that triggers a file download/save (e.g. saving a photo/image inside a Codex session) causes a recurring error dialog: "A JavaScript error occurred in the main process — Uncaught Exception: TypeError: h.setProgressBar is not a function".

The stack points to a DownloadItem event handler, so the app appears to call setProgressBar on an object that doesn't have that method (likely DownloadItem; the actual API is BrowserWindow.setProgressBar).

Environment

• App version: 26.820.7780.0 (ChatGPT.exe 151.0.7922.170)
• OS: Windows x64
• Install source: Microsoft Store (package OpenAI.Codex)

Steps to reproduce

1. Open the ChatGPT/Codex desktop app on Windows.
2. Start a Codex session and ask it to save/export an image (or any action that triggers a download via DownloadItem).
3. The "A JavaScript error occurred in the main process" dialog appears.
4. Dismissing it with OK does not help; it reappears repeatedly during/after the download.

Expected behavior

No error dialog when saving/downloading files; download progress should be handled gracefully.

Actual behavior

Recurring uncaught TypeError dialog in the main process.

Error text