Auto-update: app closes on Install but never re-opens (macOS Tahoe 26.2)

[mattdjenkinson]

Summary

A user reports that the in-app auto-update flow fails to relaunch the app after installing the update.

Steps to reproduce

1. User receives an update prompt in the app.
2. User clicks Install.
3. The app closes as expected.
4. The app never re-opens — the user has to launch it manually.

Environment

• OS: macOS Tahoe 26.2 (build 25C56)

Expected behavior

After the updater applies the new version, the app should automatically relaunch into the updated build.

Notes

• May be related to macOS Tahoe behavior around relaunching apps after a code-signed bundle is replaced, or to the updater's relaunch mechanism (e.g. how the helper process spawns the new app).