Native Instruments is not available as a free standalone download for the full version . The "Full" version of Kontakt is a paid professional sampler. However, you can legally download and use the Kontakt Player , which is the free version of the software. Free vs. Paid Version
Once logged in, go to the "Available" or "Library" section. Look for Kontakt Player (currently updated to version 8) and click Install . Native Instruments Kontakt 6 v6.5.3 for Mac Free Download
Necessary if you want to use "unlicensed" third-party libraries (often found on smaller developer sites) or if you want to build and edit your own custom instruments. How to Download & Install (Free Version) Native Instruments is not available as a free
If you don't have one, create a Native ID to log in. Native Instruments Kontakt 6 v6.5.3 for Mac Free Download