Libraries that are developed for Kontakt Full (open format libraries) do not require authorization via Native Access. That is why these libraries do not come with a Native Access serial number. Unlike Kontakt Player libraries that can be opened via the Library tab in Kontakt, you use Kontakt’s “Files” browser to load patches, or even better, Kontakt’s Quickload feature: https://www.youtube.com/watch?v=krwzsLSNs4A