itch.io

Mac apps will complain they "Can't be opened" likewise "Permission denied" via running the executable under Terminal when the *.app/Contents/MacOS/executable doesn't have the execution permission set. You can try out my post about a helper script that fixes both permissions and removes the extended attribute com.apple.quarantine from these new apps which means it can open as soon as possible or take the manual approach (you shouldn't need to do the jre part for the current build meaning step 5 and after you can ignore)

Nevermind you still need to replace the jre to get the app to work. The new Mac build fixes the "DesktopLauncher quit" problem so you can run the jar (though the jar method seems to be a 50/50, not sure if I'm not waiting long enough or if it's something else), but didn't fix the app crashing instantly. My previous post has the link to fix these issues or here