So my friend and i just bought left for dead 2 bundle from steam. He have very high speed internet connection so he downloaded it. i just picked up his left for dead 2 game data files folder which was 12gb from his steamapp folder in a pen drive. so i wanted to ask that how i cane place that game data on my pc so that steam doesn't download it again but insted recognize that game data files ad my game data files. plz help