I bought Kontakt 7 and downloaded the free libraries but I can't hear anything when I play.
Hi @Jaimedmolina if you haven't already, please see this article here on how to configure audio settings in Kontakt: https://support.native-instruments.com/hc/en-us/articles/210278845-Configuring-the-Audio-Settings-in-Kontakt
Headphones? You might need to adjust the headphone audio output settings on your Mac.