The full version of Kontakt is required to run non-commercial instruments/libraries. In other words, these free ones will only run in Demo mode in Kontakt Player which, correct me if I’m wrong, sounds like the one you are using.
AFAIK companies have to pay a licence to Native Instruments to have their instruments/libraries run in the free player. The full player does not require this licence; hence you’ll only be able to run non-commercial instruments in the full paid-for Kontakt version.
