It depends on what you want to download.
You will first need a file decompression program. The main 3 are:
Then go to the URL link below.
http://www.garrysmod.org/downloads/
You will need to sign in by pressing "sign in through STEAM", put your username and password in, and then click "click here if you don't want to wait"
Then simply choose which one you want to download.
Note: a download will have a readme.txt that will tell you how to install it.
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Y is there a xbox 360 garrys mod
Go to www.garrysmod.org and download the latest version of DarkRP.
you cant unless you download an add on (http://www.garrysmod.org/downloads/?a=view&id=46486)
no because garrys mod requires that you have a game that uses the source engine
gmod is 10$ at garrysmod.com