help with Halo 3 Beta 1.zip

I do not know how to install the models, when I download it shows me 2 folders, matirials and model, but when I put it in gmod addons folder, do not work, could explain step by step how to put the package, please

thanks

this is the link
http://www.garrysmod.org/downloads/?a=view&id=124457

Did you create a spawn-list for them or is one included?

???
i don’t understand please explain