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I've tried a few times to run the Mac version, but I just get  "This app can't be opened", which probably indicates some permission problems, or a corrupted zip archive. I've tried unzipping it with tools other than the standard OSX archiver, but it still doesn't work.

Hello! Are you running Catalina on your Mac? If so, that’s because Catalina has very strict permissions for unverified apps. There’s a workaround here, although I can’t verify if it actually works because I don’t have a Mac. If you’re running an older OS than Catalina, can you let me know what you’re running and what specifically the error message says and I can try to troubleshoot? 

Nope, this was on Mojave. Also that was the exact (and very unhelpful) error message "This app can't be opened". I don't believe this is the usual key signing error you get for unverified apps, because that has a "because the developer couldn't be identified" on the end of the error. This error, which I've had before from itch games, usually means something needs to be set executable, but isn't

Interesting. I've done a bit of research on this and the only thing that keeps coming up is something telling me to run chmod to set it as an executable but I can't do that on a PC. I'll rope in a friend who has a Mac and see if I can figure out the problem from there!

Got it. You need chmod u+x on

Then it runs. The app bundle itself is already executable, but I that file needs to be as well

Thank you! I think this is unfortunately something I can't fix in the build, not sure why building to Mac from a PC in Unity is so touchy but alas. 

Mojave here, and no such error—just the usual right-click-to-open and confirm. Guessing it was an isolated incident. So, good news: it’s not the build! Bad news: no idea what it was.