WAIT
Did he man ALL the folders in there to be put in the garrysmod/garrysmod folder like this?
C:/Program Files (x32)/Steam/(username)/garrysmod/garrysmod/models
???
Uh yeah. Just take the materials, models, sounds, maps, etc. folders that come with the download and put them in the filepath you are talking about. Merge the folders, and all the stuff from the download will be in the game.