Out of interest I just downloaded a few AppImages for versions back to 2.0.11 and ran them on Kubuntu 21.10. None actually notified me of an available update so I guess the option is not needed as it does not check.

It's just a guess but the auto-update feature does not actually auto-update; it shows a notification with a download link. This is not that useful for Linux which uses a separate download & update script.

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