Well, it's still there, just not linked to. Can't really speculate as to why the link was removed, but the code wasn't exactly pretty in the first place. Ben really, really needs to learn how to use source code revision control:
http://www.benheck.com/Downloads/amh/AMH_code.zip
EDIT: Ah ok, I see that zip only has the v22.
Again, @benheck, please start using something like Github, it's really not that hard.