I seem to be unable to play it on mac it is giving me UnknownError Error:EROFS: read-only file system, open 'Chapters/Upgrades. I do not know what to do even after I tried to re download it. Please anyone let me know what I need to do to fix this problem.

Same here. However I seemed to have found the problem. When you open the "Chapters" file and open the "Upgrade" document, there's nothing in it. The whole thing is blank.