Hi Chainik jan,
Matter of fact, I do have other Python & Vapoursynth installations. These stem from FlowFrames, FrameGUI etc. from what I could gather. Please see a screenshot below of everything that I could find pertaining to Python & VapourSynth:
I'm at a loss here - I even wiped windows installation (but kept personal files) and still doesn't want to work. Now it just says "TensorRT requires vapoursythn inorder to work"