Hmm, I haven't seen that particular error before, but we can always try the usual solutions for Mac issues. When you say you weren't putting in the folder properly, do you mean the game wasn't in your applications folder? Because that's another potential cause of issues. Basically the first thing to try with bugs on a Mac is permission issues, so moving the game to the applications folder can help, as can editing the game folder and ensuring it has read/write privileges. Let me know if that helps at all.
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This link should explain it better than I could. https://support.apple.com/sl-si/guide/mac-help/mchlp1203/mac