Well this was the exact order I installed everything.
1. Module Manager - Jan 23 version
2. Just another Cross-sell mod
3. Module Manager - Feb 2009 version
4. Cross sell mod advanced - old (this one you can find on post #608

Everything was overwritten each other. The module manager in the Feb 2009 version has the yclass that you need. You most likely downloaded the first one, like me, which was the Jan 23 version and that is missing three folders in the includes folder.

This is not a solution though because I ran into that error when I try to click edit and delete in the advanced cross sell control page under catalog. I can add it and it shows up but editing it and deleting it is not possible right now for me.