I can't really help with mac problems, but some general advice. "It's not working, how do I fix it?" doesn't really help, so there's no info about WHY it's not working. When you're looking for tech support, details matter and help a lot to fix the problem. So, things like what version of your OS, what happens when you try to run it (IE literally nothing, it opening then immediately closing, exc), any error message you got.
One thing to make sure of, you did extract the files before trying top run it, since most game won't work without first extracting the files.