Age of Empires II

I've just upgraded from an older powerbook to a macbook pro and everything works great. But I'm unable to install Age of Empires II. I get an error message that a file is not found. It ran on Tiger just fine, but not Leopard. When I was running Tiger I did also have a copy of version 9 on the hard drive, but bringing up the game never indicated that it shifted the os to the older version. I guess I'm wondering if there's a relevant folder there but that's just fishing. It's not a critical issue, but I miss the old time waster. Any ideas?