It's wonderful when something Works.
So my approach:
1. NU Audio Software uninstalled!
"Restart PC"
2. Nahimic app 1.6.5 updated in the MS-Store
"Restart PC"
3. Performed "sfc /scannow" in the command prompt with admin rights
"Restart PC"
4. The two Files x64 and x86 downloaded and installed!
The Link:
"Restart PC"
5. Visual Studio Community 2019 has to be downloaded from WWW. search......
and download / install the complete C++ environment!
"Restart PC"
6. EVGA NU:
Reinstalled and it works