I need help with a model

Recently i got gmod and decided to install some models and stuff, and i found a player model and npc model pack of neo combines and it looked really awesome, so I downloaded it. It told me inside the winrar zip. that to install the model i had to extract it on C:/program files/steam/steamapps/my account name/garrysmod/garrysmod/ folder, but when i installed it there, it didnt showed up. So i decide to overwrite the folder on the same location and restart gmod but nothing. So i just want to know if anyone has tips or knows how to fix the problem. Thank you!

P.S: If you want to download it heres the link http://www.garrysmod.org/downloads/?a=view&id=76713

P.P.S: This isnt my model pack.