With the new update from Native Instruments, the process of adding a library to Kontakt and activating a library has changed, and is now done through the new Native Access application by Native Instruments.
Please follow the instructions in this link:

Also, if you need to download Kontakt 5 Player, you will need to use Native Access instead of the link currently provided in our Quick-Start Guide and user manual.
We are in the process of updating our documentation to reflect those changes.

To download Native Access please use this link: