Problem: Jam Pack "Rhythm Section" and OS X Lion

Very simply, I cannot get this to install under Lion.

I have a partition with just Snow Leopard on it (yay!) where it will install (yay!) but it won't allow me to install to the Lion partition (boo!) and moving the files from the SL partition to the Lion one doesn't seem to do any good (boo!).

I've read several tutorials about the "hacking" of the World Music installer (show package contents, run Tiger installer, etc), but that doesn't work on the Rhythm Section Jam Pack.

Can anyone help? I'm losing my mind over here.