Install CSS with Dedicated Server

I wanted to play multiplayer (rp_downtown) but I need CSS to do that. I can’t buy it but I wanted to know how to use the Dedicated Sever downloader thing to install CSS into garrys mod in my account. I dont want to make a sever, I want to use the dedicated server to install the CSS content in. How can I do that?

You can’t, buy the game.

I was just wondering if I could use the dedicated server to install it though.

You want Counter-Strike: Source assets for free, so you either have to pirate the game and install every singe material model and sound into the GMod directory which is obviously illegal, or you can buy the game for $20.