JarateKingJust as some debugging, you wouldn't happen to be using a mac or linux would you? That might explain both the .bat file breaking with selecting options, and the actual scripts generating it failing (since it depends on running other scripts which run some imagemagick executables, which I'd wager is why everything appears black).
I'm on Windows 10. I dual boot Windows and Linux but I don't think that really matters for running the script when I'm on the Windows install. I'll try the vpk you put in the zip, thanks a lot.
As a side note, the black textures actually look kinda neat in their own right even though it's an unintended side effect.