Alright, I've been having a problem running Keen on Mac, hopefully you can help me out.

I've pretty recently switched to a Mac, and have been wanting to find a way to run my all time favorite game, Commander Keen, on it. I found out about DosBox recently and downloaded it in the hopes it would work, then I downloaded the free demo version of the first Keen game and it did work! Success! Yay!

Unfortunately I didn't quit while I was ahead. I went to ID software and found they were selling the old games in a bundle, however they plainly stated "PC ONLY, doesn't work on Mac or Linux." I promptly ignored this warning, figuring if the demo worked in DosBox the full game must too, right? Well, I bought it and it gave me a file called commander_keen_setup.exe, (I renamed it setup.exe because I didn't want to type all that, though,) I tried to run this and got the message: This program cannot be run in DOS mode.

Sorry for the long post, I just wanted to make sure nothing I did was the causing the problem. So, can I do something to fix this?