Is there a way to run kontakt 8 on mac os big sur?
No , not as far as I know, , Mac OS 11 Big Sur is not even compatible with the latest Kontakt 7 update version.
Compatibility of Native Instruments Products on macOS
Kontakt 8 : System Requirements : macOS 12, 13, and 14 (latest update), Windows 10 or 11 (latest Service Pack)
I am using Komplete 14 now, with Kontakt 7, and it works seemlessly on Big Sur!
? , Yes ? , Big Sur is compatible with both Komplete 14 products within specifications given at the page : Compatibility of Native Instruments Products on macOS and/including Kontakt 7 up to version 7.8.1 .
However N.I. announced deprecation of Mac OS 11 support for N.I. software e.g. Native Access back on July 24 , 2024