1.Download and Install Steam http://store.steampowered.com/ 2.Log in into an account (you can register a new one here http://store.steampowered.com/ or you can use your old one) 3.Turn off Steam. 4.Copy the folder from the archive in Steam's main folder. 5.Turn on steam and start the game from X:\Steam\steamapps\common\Counter-Strike Global Offensive\csgo.exe (X is your drive and Steam is for the Steam's main folder, csgo.exe is the file you must start to play!) 6.Have fun (you can play online!)