It strips the custom system icons from the scheme it goes with, and creates a "Lite" version.
Oh no!! I'll lose the Full version forever!!
No you won't - it creates a copy, and leaves the original, Full version untouched.
So how do I make it work?
Doubleclick on it - then simply follow the instructions in the built-in ReadMe. It'll take you less than 30 seconds of your time.
Will it work on my other schemes?
No. It is designed specifically for the scheme it comes with, and may do irreparable damage to another scheme. It will also make your nose more bulbous, and hair grow out of your ears.