No specific info about version 6.3. Please visit the main page of Kontakt on Mac Informer.
KONTAKT 5 - an immense 43 GB sound library containing over 1000 instruments.
A flexible and versatile audio sampler designed for professional musicians.
First Call Horns is powered by the Native Instruments Kontakt Player engine.
KONTAKT PLAYER - free sample player based on award-winning KONTAKT technology
It enables you to conceptualize and build instruments that are uniquely yours.