Play as Infected on L4D2D

So for you guys who have the demo and cant wait for the full version, I figured out how to play as infected. Just got off with Chunk and had a blast. Here's the link, Download and extract to appropriate folder. Commands are in instructions on web page.

http://www.l4dmods.com/index.php?option=com_content&view=article&id=282:play-as-infected-with-the-left-4-dead-2-demo&catid=2:news&Itemid=13

have fun!