RSS with nyaa and ktorrent
Using RSS with nyaa works with several torrent programs like qbittorrent, ktorrent and others. I use ktorrent since it's foss, kde projects are usually nice, and it has most features I would like.
To generate the RSS URL, search for the series but omit the episode numbers
Then click RSS.
You will be taken to a page with XML, copy the url from the browser address bar.
To use rss with ktorrent, enable the syndication plugin.
Once enabled, navigate to the syndication tab.
Click the add feed button.
Paste in the URL and click ok
Now new episodes will show up as unread.