Oof Mac? You'll need to set up something extra to play the game such as PlayOnMac. This thread can guide you through that: https://feral-heart.com/smf/index.php?topic=66865.0
If you are updating from an old version, it may also be a good idea to remove old files from old versions of the game before doing an install since the files may not always be replaced properly or the game might magically use the wrong ones, fh is touchy. xD