I have the same problem. I did not install the extras. When I started the program a window pops up that says "To continue using basic non-commercial version of PocketMusic please register. Registration is FREE!" Then it has a place to enter the code, then it says "To get your FREE reg. code, visit
http://www.pocketmind.com/reg.htm"
The page the link takes you to is a place to buy the full featured version, and has nothing to do with the freeware version.
It totally sucks.