This driver update was one of the first I had problems with. I did upgrade to win11 24H2 like you did and then installed the new driver. Battlefield would not run no matter what, then FS2020 started to present some stutters and Framegen also suffered severe blur. Without framegen the stutters were still present and no apparent drop in FPS. It was like playing a 30fps screen capture, but the fps were the same as always.
If you do not want to downgrade de nvidia driver try cleaning the DirectX cache. There is a tool to do that specifically for FS2020.
Abou the sound, I found in the past that you must have the correct one if it is a Realtek device. This is the only case were I download the drivers from the manufacturer only. Try installing the latest for windows 10 anyway, maybe it works.
Try the new cumulative update for 24h2 from today.