huh? When you downloaded the .zip from garrysmod.org I assume, there was a folder in it named gm_ghosthunt2, three pictures, and a readme.
Just put that gm_ghosthunt2 folder you downloaded into your garrysmod addons folder
this is what my main garrysmod directory looks like
then inside the "Addons" folder is this stuff
and you should be set
if you're really having trouble, add me on steam- Meeses and download this-
https://join.me/