I was just trying to open a macOS app packaged by a third-party software company that doesn’t exist anymore and I was getting the following error:
You do not have permission to open the application “Mac.app”.
Tried everything I could find to open the app and only the following solution worked for me — I had to sign the app again.
codesign --force --deep --sign - /path/to/the/Mac.app
I hope this helps someone.
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