Make VSO Downloader work through the proxy (Tor)?

[Trueman]

How to make VSO Downloader connect to the internet and download through a desired proxy connection (including Tor, which is by default Socks5 127.0.0.1:9050)?
If I don't do it, I can't download from .onion sites (VSO sometimes detects streams from Tor browser or Tor-connected browser) but can't download the full file, only a ~some-bytes corrupted part, probably because it tries to download through the main internet connection and fails.
Can't find a proxy setting in VSO Downloader.

[Benjamin]

the VSO proxy is connected to the localhost and use a non used port reported by the system.
can you provide an URL to repoduce this issue.

[Benjamin]

for now TOR browser cannot be supported by our solution as it uses its own tunnel.