Ahh I was so hoping this would work, after I selected "Re-scan" in IslandRum launcher window it regenerated the folders and everything, but it still says it cannot locate the game data files and may be corrupted. 😞 I tried deleting version.ini as well in case that was doing something weird and same result.
I did notice something odd in the islandrum.sh file: there's a random backslash at the end of the target launch directory. I don't know much about this stuff but mac doesn't use backslashes, could this be a typo/weird conflict? I haven't looked at this file while the game was working so I don't know if it was always that way, unfortunately. I tried editing it but it just got rewritten by the launcher :I
tysm for the suggestion though!