We've discovered that our SOCKS5 proxies are blocked by most popular torrent trackers.
There's not much we can do about those at the moment except let you know that we've noticed the issue and plan to rotate the IPs around so the new ones aren't blocked.
In the meantime, please use our desktop application to change your IP and try downloading using that configuration.
Make sure to connect to the VPN before you launch your torrent client and then completely exit the torrent client before disconnecting. This will ensure that the downloads go through our IP and not your own.