try this to try to fix any MAC issue you may have , credits to user Ianm
I've found a fix for the issue on Mac where you get a bouncing icon but the app doesn't start.
Has to do with permissions, perhaps relating to apps that are extracted from a .rar file (?)To fix, open a console and type:
chmod +x /Applications/FrozenNightmare.app/Contents/MacOS/DesertGameAnd then it should run. Cheers!