Most Sonokinetic libraries do not have a Native Instruments kontakt player license. You will need a full version of Kontakt 4.2.4 or higher (so not the Free Kontakt Player) to use non-player instruments. So please make sure to check if you have a full version of Kontakt before buying a library programmed in this format. Sonokinetic products that do carry a Library License are Vivace, Minimal, Grosso and Capriccio.
Check the video given below for more information.