JavaScript error in main process - TypeError: h.setProgressBar is not a function

What version of the Codex App are you using (From “About Codex” dialog)?

26.820.7780.0

What subscription do you have?

Pro

What platform is your computer?

Microsoft Windows NT 10.0.29648.0 x64

What issue are you seeing?

A JavaScript error occurred in the main process when handling a download item:

Uncaught Exception:
TypeError: h.setProgressBar is not a function
at DownloadItem. (C:\Program Files\WindowsApps\OpenAI.Codex_26.820.7780.0_x64__2p2nqsd0c76g0\app\resources...:289603)
at DownloadItem.emit (node:events:508:28)

What steps can reproduce the bug?

1. Launch the Codex Desktop application on Windows.
2. Trigger an action that initiates an internal download or file save operation. Mine was steering a new message.
3. The application throws an "Uncaught Exception" dialog in the main process during the DownloadItem event.

What is the expected behavior?

The file or asset should open or trigger an action with progress updating smoothly without throwing an Electron main process error dialog.

Additional information

The error indicates that the Electron window/taskbar reference (h) passed to the DownloadItem progress handler is either undefined or missing the setProgressBar method on Windows.

No repository file or test is named; start by locating the Electron main-process DownloadItem progress handler corresponding to the reported setProgressBar call, then reproduce the download or file-save action on Windows. Done means the action completes without an uncaught main-process exception and progress updates work as expected.