I have a couple of questions. My friend and I want to play custom zombies and were wondering how to set a match up.
First, I know that you have to have the game. We both have Mac's. Do we have to buy it or is there a download link?

So basically my questions are:
Is it possible to play cooperative on custom zombies on WAW or a Mac?
Is there a Mac download link?

Any answers are appreciated. Thanks so much!!