1. Click start > search %appdata%
2. Go into the folder .minecraft > then go into folder versions
3. Drag and drop the hack client in there (you have to exact the hack client, don't drag and drop the zip/rar file)
4. Open the minecraft launcher > new profile > Make a name up for your profile (just make it the name of the client > check the box that says Enable experimental development versions > In the use version drop down menu, select the name of the hack client > Save profile
5. Select select the name you made up for your profile (its on the bottom left corner)
6. Click Play