Just a thing.
When you say :
b) Select all transfers for which you'd like to change the tracker URL. I recommend the Text Filter with search for Trackers enabled (can be turned on in the Layout menu).
I don't really understand what you want me to write in the Text box. The filter is turned on as i use it often, but it only search among torrents names, not Trackers URLs.
Tell me if i'm wrong, but the point of this part is to filter torrents I want to change tracker url, so I can select them all and remove old tracker URL ?
I try your method on a few torrents and it works well. Url is replaced with the one I put in trackers transfers settings. So it works fine.
Thank you so much for that, and anyway if I can't filter concerned torrents, I'll pick them by hand.