when I did that, it said "Polly The Frog 2 island Hopper is damaged and can't be opened", but that may be because my computer is old. it's an iMac from 2009 running OS X El Capitan.
hmmm, that could be the issue. I don't own a mac personally so I wasn't able to actually test the Mac build much outside of play testers. I could try getting one of my friends with a newer mac to test to see if that's the issue or not.