Hi!
I saw that you edited the code to work on Windows but from what I see it seems to be slower than "Linux" version.
Time ago, I created a stand-alone package to make GPEN upscaler run on Windows, with the original code. It doesn't requires python/MSVC/CUDA installed, just NVIDIA driver.
I would like to share this package here, maybe also in official README cause I'll upload it with any new commit.