Jsk, do I drag the zip to garrysmod/garrysmod or extract? I don't know why it's not working. Also, did you download the mirror or main file?
Nocturni, so I do Extract Here so the files are on my desktop and drag the files to the AddOns folder? That's what it seems like you're saying to me.
I don't see why you have such a hard time comprehending add-ons. Put the folder that's in the zip folder into your garrysmod/garrysmod/addons.