This product is a non-player library and requires Kontakt Full Version 5 or later (it may also work with earlier Kontakt versions, so please test the trial version before buying). For Kontakt version 5.6.8 or higher, non-player libraries (i.e. libraries without a serial/activation protection), which cannot be used in Kontakt Player version) need to be loaded via the Kontakt files tab. Please see the video on our site for instructions. Please load the trial version via the files tab in your full version of Kontakt and check that you are not getting the "activation notice".