I tried to use Nvidia denoiser because I have Nvidia GPU. The raytraced and arctic display modes were completely white - no objects were displayed. When I turned the raytraced mode on Rhino became unstable and it crashed without any bug report.
Next I tried to use Intel denoiser. It did not work. Options>Render>Post Effects window was empty. I disabled the Nvidia denoiser, but it did not help - the Post Effects window was still empty. I uninstalled the Nvidia denoiser - the Post Effects window is still empty.
I use Rhino 7 commercial version and ThinkPad W530 laptop computer with Quadro K2000M GPU (Nvidia driver 426.78, 2020-6-24, this is the latest driver available now).