SO apparently I need this mod so I can actually have most of the cars on your server, instead of driving a freaking ERROR. My question is, how can I install it, I mean GMOD is a MOD so how can you mod a mod? Maybe you can add 1 or 2 more cars that you don't need this mod to use.
First of all, download GMOW. Which is on the Facewan GMOD9 section. ( Gmod 9 Server Mods ) Then, take the folder and extract it to SourceMods\gmod9\mods