I found an old Zoo Tycoon game and tried to download and play it on my MacBook Pro, but after it installed the app's picture was crossed out and attempting to open the game resulted in the error: "You can't open the application 'Zoo Tycoon' because PowerPC applications are no longer supported." I was wondering if there is anything I can do to play this game, or if I have to give up on it and buy a newer version (if there are any that mac still supports).