Apple Store Apps quit as soon as I try to open them

Hi Dame Hyndman,

Thank you for posting in the Apple Support Communities. We understand apps you've installed are crashing when you attempt to open them.

We'll want to work through the troubleshooting steps linked below, to get you up and running.

• If an app freezes or quits unexpectedly on Mac

Cheers!

I have the same issue as well as many other people. The issue has been reported in eight different discussion threads that I know of.

https://discussions.apple.com/thread/252030900

https://discussions.apple.com/thread/252037712

https://discussions.apple.com/thread/252032870

https://discussions.apple.com/thread/252060316

https://discussions.apple.com/thread/252056821

https://discussions.apple.com/thread/252061206

https://discussions.apple.com/thread/252030032

https://discussions.apple.com/thread/252059424

Observed behaviour is:

Almost all apps downloaded from the Apple App Store crash with a 'Code Sign Invalid' error (CODESIGNING).

It's not conclusive, but the issue seems to...

...have started around Wednesday last week (2020.11.11);

...affect macOS High Sierra (all versions, unpatched and patches);

...affect systems that have had the operating system recently reinstalled.

I'm posted a request from PeterPeterPeterPeter (https://discussions.apple.com/thread/252030900?answerId=253955318022&page=2) for us to report this issue on the two Apple feedback resources below...

Please help by reporting to Apple here https://apple.com/feedback

and here https://feedbackassistant.apple.com !

Yes...

https://discussions.apple.com/thread/252037712?answerId=253917654022&page=1

where is the 'not helpful' button?