Ok people are having difficulty using this and the author of the hack is not providing a very thorough explanation or guide to using this hack (no offense but it's true).
1. You download the RAR file and extract it to your desktop.
2. You go to C:\Program Files (x86)\Steam\SteamApps\common\Counter-Strike Global Offensive\csgo and create a folder called "addons".
3. Once you're in there, add the CS-GO TextureHack.vpk into the "addons" folder you just created.
4. If you go back one folder, out of addons, inside C:\Program Files (x86)\Steam\SteamApps\common\Counter-Strike Global Offensive\csgo, there will be a file called pak01_dir.vpk.
5. Go back to your desktop where you extracted your RAR file, there will be a file called VPKPatcher. All you have to do now, is drag the pak01_dir.vpk file ONTO the patcher file and wait for it to be done. Then you open up cs:go, and it's working.