Firstly, please check that you have the Full version of Kontakt and that it's version 6.0.2 or higher.
If that is the case, here are the ways you can load the instrument:
- by manually drag-and-dropping Ascent's NKI files into Kontakt;
- from the Kontakt's Files tab, by finding Ascent there and loading the NKIs from there.
From the Files tab, you can also drag the Ascent's folder into the Kontakt's Quick-Load catalog and have a quicker access to it every time.
Please note that the instrument won't show in the Libraries tab.
If you are seeing 'DEMO' you are probably attempting to load the instrument into Kontakt Player.
Please have a look at this article's Kontakt Player vs Kontakt section to get familiar with the difference between Kontakt Player and Kontakt Full: https://www.native-instruments.com/ni-tech-manuals/kontakt-player-manual/en/welcome-to-kontakt-player
Please check that you have the Full version of Kontakt installed and authorized and that it's version 6.0.2 or higher and load Ascent there.