Few updates ago, transmission removed blocklist from their application. So now users need to add a own address to get it back again.
So just add this address and you are using same as you did before. As transmission used same file, but it was located on their server instead.
Here is the address to add: http://www.bluetack.co.uk/config/level1.gz
226520 rules will now be blocked.
Blocklist for Qbittorrent
This would work in Deluge and maybe in other torrent clients, but it won’t work in QBittorrent client. That’s why I have created a own page how to get ip filtering to work in qbittorrent. Read about that here: Add blocklist for Qbittorrent