I went through your powershell script and it always failed for me so i fixed it up to make it more accessible until you come out with preconfigured 'packages' for v2
Improvements.
No need to redownload files if they are already downloaded. (thats also why cleanup is commented out - let users delete the remainder files themselves since we only need the C:\mpv.net folder).
mpv.net folder was not being copied correctly to C:\mpv.net because it was missing recurse.
Also fixed the download of $fileMpvUpscale = "mpv-upscale-2x_animejanai.zip" as it caused errors as a bit transfer when it should be a web request.
I went through your powershell script and it always failed for me so i fixed it up to make it more accessible until you come out with preconfigured 'packages' for v2
Improvements.