Well, my installation, in VR, still crashed after a while, even though I was not using DLSS, even though it lasted longer. May be it was not entirely DLSS4 problem. I am doing a clean install once again and see how it fares.
I may have missed something as I am not aware of the 3 files, not just the nvngx_dlss.dll. I copy the file to both bin and bin-mt.
Anyway, I think one should choose something like "Preset K".