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It would be great for some if there was a translation from that Sennheiser site to English. I have never been able to decipher that one enough to register it. But thankfully I grabbed the Soniccouture Estey Reed Organ when it was offered for free a while back, and obtained the same Kontakt crossgrade privileges.
I had no idea a cross grade would work for sample packs. I also picked up the Reed Organ for free. Registering with Soniccuture also give you further free packs, but I never bothered because they don't work on Player.
I just went to check with NI and logged in to check if I was viable. It confirms I am, because I have SampeMdelling's Trumpet 3. It doesn't mention I am because I have the Reed Organ, but it as doesn't mention that I am beacuase I also have SampleMdelling's Trombone or their Tuba and French Horn. Seems it just list one of your purchases, instead of all.
Picking up a Kontakt Player sample pack on special could work out well as means to get a foot in the door. SonicCouture had some great deals in January, I think half price. This will probably come around again. They seem t have the best Vibraphone out there