2-16-13: Initial Release.
I’ll keep it short. At the forums of the planetcss.com, they have what is called a junkies client. It allows you to download the entire CS:GO game, and then it has the ability to not only patch and update the game, but give a valid client.dll file that you need to play the game.
The best part? You can LAN with it in Tunngle!
See the video tutorial below that shows you where and how to get this game, and play it online. If you got to the youtube link, the text tutorial is there as well.