Ok now i got Windows 10 20h2 installed.
But the workaround for the GPU ERROR 43 for the Nvidia Card seems not working anymore.
I always used the Settings descriped in the Archwiki. But there, they removed the Section entirely. Dont know why. https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
I tried https://marzukia.github.io/post/fedora-32-and-gpu-passthrough-vfio/
But that dont work too. Still ERROR 43 Code.
VFIO in 2020 Fedora 32 - An alternate route dont work either.