I need advice about a runtime failure in Video2x 4.8.1

[bluekitepete]

I'm new - so apologies if I'm posting this question in the wrong place or the wrong way. Please advise.
I have Win11 and I'm running video2x to upscale some .mp4
I'm running the video2x_gui.exe using the SMRD NCNN Vulkan driver.
The app launches OK, creates the CACHE folder and the 2 required sub-folders.
It processes the source video and creates the .PNG files (one for each frame) in one of the sub-folders.
Then it bombs out with ERROR 4294967295
Then it deletes the CACHE folder(s) and everything in them.
Any suggestions?
I've installed Linux, Ubuntu, & Python, and I've changed my BIOS so that virtualisation can happen.
Many thanks in advance - I hope - Pete

[bluekitepete]

My feeling is - it's not finding a dependency.
I see from other threads mentioning ERROR 4294967295 that it might be a PATH error - there might be a hard wired PATH in the code. I'm running it (as Adminsitrator) but on an external drive. Do I need to copy it to my C:/ drive? If so, where should I put it and what should I name it? Any advice please?