You might have better luck with this: https://github.com/tool-maker/VPN_just_for_torrents/wiki/Running-OpenVPN-on-Windows-without-VPN-as-Default-Gateway
You add routing table entries to put the original default gateway back in effect (using a provided script - copy and paste). And then bind the torrent client to the VPN interface (or address) to have it use the VPN.
I have used this (I wrote the scripts there) for many years.