No kit pieces

I installed a bunch of MIDI drum loops for Superior Drummer and they show up under the Grooves tab in SD.
I choose DKFH > Metal > Grooves > choose groove > then is says 'Kit Pieces' in the final column, meaning they're missing. And all those grooves that say 'Kit Pieces' won't play anything - and there are a lot.
 
How could I have achieved that!?
 
The exe looks for the appropriate EZ or SD folder and does everything for you. More importantly, how do I fix it?
 
Thanks - rev