XnView Software

I later downloaded XnView and tried the registration key with it. That worked, so it appears the registration key I received is only for XnView, not also for XnViewMP. How do I register XnViewMP?

I bought a license for XnViewMP at kolor.com. When I enter my name and the registration code, I get an invalid code error box, saying that the name or code is invalid. The registration info that I received says the program is XnView, not XnViewMP. Did I make some selection error during my purchase?