I don't have a Mac so troubleshooting is hard for me, but there are steps that work. Here's something that I got from a Mac users on the Discord
"If it says permission is denied to open it, try opening the terminal and putting "chmod -R a+x" then leave a space and drag the game icon into terminal, then hit enter. This works for any game that permission is denied for. Disclaimer: I have no idea why this works but it does."
If that doesn't work get back to me, or joking the Discord, and we'll see if I can help you further