And you shouldn't be missing any textures on any map. Then put folders with content to garrysmod > addons
I've found that with some of my friends that website doesn't work with ALL content, or just CSS sometimes, so if it doesn't work, look into here:http://fragplays.com/gmod-textures/ It's basically the same thing
"It never hurts to keep looking for sunshine" - A. A. Milne