You don't. Go buy it at steam! It's only 10 USD
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gmod is 10$ at garrysmod.com
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