Checked support and Googled too, seems like this is a local issue but can’t figure out what.
The auto update feature on GitHub Desktop won’t work.
It says it will self update on a restart but it never does.
Trying to do it from the “about” menu doesn’t work either.
Choosing Quit and Install Update
does nothing.
EDIT
Command line fu reveals the issue, but why and how to avoid this in the future?
xattr -l /Applications/GitHub\ Desktop.app
com.apple.quarantine: 01c3;60492eb5;Safari;E6C0510B-8E98-421F-A67F-506900D02B2C
Removing quarantine doesn’t stick.
xattr -d /Applications/GitHub\ Desktop.app
xattr -l /Applications/GitHub\ Desktop.app
com.apple.quarantine: 01c3;60492eb5;Safari;E6C0510B-8E98-421F-A67F-506900D02B2C