If you are seeing the word ‘DEMO’ written on KONTAKT, one of a few things can be occurring : Non Player library If the library doesn’t work with the free KONTAKT Player software, it will only run in ‘DEMO’ mode meaning you will be bale to use it for fifteen minutes. After that, there will be no sound on the output, and you won’t be able to access the editing features. To solve this problem, you will need to upgrade to the full version of KONTAKT. To know which version of KONTAKT your library is requiring, look for the mention "Works with KONTAKT Player" or "Full KONTAKT needed" on the product page. Player library Due to errors in Native Access, Player libraries can sometimes run in ‘DEMO’ mode, even if correctly authorized. In Particular on Mac OS. Follow the steps bellow o resolve the problem : From the location, HD/Library/Application Support/Native Instruments/Service Centre remove the .xml file for the library, Kontakt and Native Access. Delete from the location Mac HD/Library/Preferences - Kontakt and the Library. Reinstall Kontakt from Native Access, then add the relink your library from Native Access. Sometimes certain files in the above locations might be missing, for example the XML for a library. That is ok, and continue without deleting that.