Advice on settings for cleaning up highly compressed video

[Perseverant]

BasicVSR++ is under Vapoursynth->Others, since it's more for restoration than denoising.
I used DeSpot with the default values and MCTemporalDegrain with 'veryhigh'.
Also, note that I adjusted the filter order (Vapoursynth->Misc->Filter Order/Queue) and moved BasicVSR++ after MCTemporalDenoise.

Cu Selur

I'm feelin' dumb.  There's probably some basic UI feature I'm missing, or I might be looking in the totally wrong places, but I'm hitting dead-ends, probably because of things implied that I don't know.  I'm on the latest release.  I'm sorry.  Can you provide a little more guidance?  This is the best I could do:

MCTemporalDenoise in Vapoursynth>DeNoise tab (I did not see a "MCTemporalDegrain" option in any of the tabs, or a "very high" selection):
   

BasicVSR++ in Vapoursynth>Other>Filter drop-down is throwing an error:
   

EDIT: I found Despot in Vapoursynth>Artifacts as well, so I think I'm good on that one...