What do you mean by "it doesn't work at all". Maybe you could try explaining yourself a little more. Where does it go wrong? What version of iTunes and GarageBand do you have?
What I'm saying is, be constructive 🙂. I'm fairly new to writing scripts, so there is definitely a possibility I didn't do that great of a job. However, every computer I've tried it on has worked fine as long as you follow the directions to set it up and you have the right versions of the software. Details can be found on the website.
I just released version 1.3, so maybe that will fix your problem!
Brendon