Dark Messiah Lich

I was wondering if anyone could port over the Lich from Dark Messiah or tell me how to get the creatures from the game to garrysmod, I own this game so should be legal. Here is a picture

there’s a pack on gmod you download it and put it on addons it contains props, characters ,weapons… and yes it contains the lich !
http://www.garrysmod.org/downloads/?a=view&id=87653

I have actually tried it, dosent seem to work for me though.

you need to download the links from that pack then use rar to extract it and put in addons then it should work

The downloads wont extract.

what type of archive are?