if you live in UK and cant find this on steam (fuck Game and gamestation pussies)
just copy pate into browser address bar and voila
steam://install/55410
seriously i remember when Game were the dogs nuts for pc gaming now its not even 1 shelf (local store) and they charge more than anywhere else for games. Last time i walked in had a look, spoke to the mouthbreather behind the till, asked what they were thinking of when they have more used games than new ones, he looked at with all his braincells and shrugged. SO i now call them Used Game, and Useless Gamestation.