Hardware encoding gone in v6?

As it's written in the release notes it might be necessary to update your gpu driver:

Quote

For using NVENC (SDK 10) encoders driver version 450.51 or newer is required.

Edit:

I just tested it with a GeForce RTX 2080 TI and a Quadro P2000 and can confirm that after a driver update (and a reboot) Voukoder 6 is working with both of them.