These resources came from a somewhat sketchy website, so I wanted to re-host them somewhere a bit nicer.

• Of course the easy thing to do would be to buy CS:S
• Download the assets package here (hosted by OneDrive)
• Extract the two folders from the zip file
• Place these folders into your Gmod Addons directory, probably under C:\Program Files (x86)\Steam\SteamApps\common\GarrysMod\garrysmod\addons
• You should now have all of the CS:S assets next time you open Gmod.