When you unzip the file, you will have scripts, mels, and other things. You have to stick these files in their appropriate places in your computer. I won't get into detail with it, but it's pretty straight forward. I for one, don't like having the bonus game plug-in appear in Maya all the time because I only use the facePathSplit tool, so I simply source the mel every tim I want to use it.
You can source scripts by opening the script editor and choosing File>Source Script. Search for the fcaePathSplit mel and press ok. Now in the script editor, type facePathSplt. You will get an error saying that it can't find some image file, but that doesn't mean you can't use it. If you look in your toolbox, you'll see that the bottom box is empty. This is actually the facePathSplit tool. Whenever you want to use it again, either select that box or type facePathSplit into the command line or script editor again.