Color me surprised… I had moved the game's folder to the desktop, which didn't fix the issue, but moving the app itself from its folder to the desktop did fix it. Never even considered this might be the issue. Thank you!
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I was going to post the same thing – I'm having this very issue on OSX 10.13, even though I tried opening the game on locations where I most definitely have write access (desktop, my home folder's Applications folder). I also tried expanding the downloaded .zip file via both OSX's default tool (Archive Utility) and The Unarchiver, just in case. Finally, I tried opening it from an exFAT formatted external disk, and in that case I got a different error – "Exception: Couldn't find file '._scripts.rpi'." (I can post the full stack trace if you want).
Regarding the "requires write access" error: clicking on "settings" -> "Main Menu" allows us to start a game, despite having this issue. However, when the game tries to create files outside of its container, an exception gets thrown. I managed to go quite far, but got to a point where an exception is thrown whatever I do, so I'm stuck.
Might this error have something to do with System Integrity Protection? You can't modify anything in
/usrbecause of that feature.
If there's any extra info you'd like to have to help fix this just let me know, I'd be happy to help.