My client is outdated and probably not good for general use, but if you're on torrents that have trackers it should still work, and I'd appreciate if you'd test it and see if it still does the job. That might give a clue to whether that's the problem. https://bittornado.com. Source: almost 3 years ago

You need a usenet provider like Fastusenet or whatever you prefer, then you need a client like sabnzb and then a search provider like NzbGeek. Source: 11 months ago

Get sabnzbd, this is kind of like your torrent client, you use this to download the .nzb files, there are many more clients if you prefer another one, here is the tutorial on how to setup SabNZBd. Source: about 1 year ago

If you use an NNTP provider, you also need sabnzbd. It integrates into Sonarr/Radarr and pulls NZBs from your NNTP provider(s) and reassembles them, including searching across other providers for missing parts, and using PAR files to repair broken files. Source: about 1 year ago

You're going to have a bad time if you don't use sabnzbd instead. Source: over 1 year ago

SABNZBD has a Linux version. Depending on your needs (and we'll leave it at that) you may need "other stuff" to go in conjunction with it. Source: over 1 year ago