This program works as detailed, however, it is important to understand HOW this program works.
This program moves your GarageBand files onto an external device, and creates system owned symbolic links in the files' place (which point to your external media)
THESE SYMBOLIC LINKS CAN CAUSE INSTALLERS TO CRASH. I had a problem with GarageBand, and had to reinstall, and continually go the error "The install media is invalid." blah blah blah.
I thought my disk was scratched. It wasn't.
Once I removed (deleted) ALL of the symbolic links on my hard-drive that GarageBand Anywhere created, THEN things started working again properly.
So, this program works great, just be careful.