As a follow-up, I ignored all the greyed-out DLSS 4 settings in Nvidia app I mentioned in my earlier post above and followed the steps mentioned by @Ianrivaldosmith and I succeeded in getting DLSS 4 to work in both MSFS 2020 and 2024 although those settings in the Nvidia app remained greyed out.
Can anyone tell me what is wrong here...After updating the Nvidia App and the latest driver 572.16 in Nvidia App it says that DLSS 4 does not support my MSFS 2020 (40th Anniversary Edition) an MSFS 2024???? My graphics card is ASUS RTX4080 Super 16GB. All the DLSS 4 settings are greyed out in the Nvidia app.