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i downloaded the unarchiver but couldn't find a way to "open with." however, my issue is that i keep getting this message, which wasn't mentioned in that thread. clicking on the ? tells me how to change the permissions, but i've already given myself the highest permission and it won't work. for reference, i have the second most recent big sur update i believe

Hmm, it look like this is a new security feature with Big Sur and not something with the game itself. Unfortunately, I don't have a recent macOS device to test with, so I can't verify a fix myself.

It looks like there may be some commands you could try in Terminal to fix permissions and allow the game to run. First off, this video might be a good starting point: 

You could also try this command before or after the steps in the video (replace "/Applications/AppName.app" with the path to the game):

codesign --force --deep --sign - /Applications/AppName.app

Let me know if this helps!