I installed Qbittorrent in my TS-231 via repo but i cannot open the webUI, everytime I click on the open in the QNAP QT it opens a new tab in web browser trying to access port 6363 but nothing is opened. THANK YOU SOOOOO MUCH ! I've been able to fix my search engines following your instructions (even if automatic engine updates doesn't work, but I've noticed that in the windows application is the same). I haven't tested that this doesn't cause any other issues or whether I should have only copied certain files but it does seem to work for now.

I also did this after updating to 4.2.5 to ensure latest files. It then gave me the list of search plugins and add ones via the other button. I then restarted qbittorrent from the qnap app centre. I then copied the files from /share/CACHEDEV1_DATA/.qpkg/qBittorrent/.local/share/data/qBittorrent/nova/ to /share/CACHEDEV1_DATA/.qpkg/qBittorrent/.local/share/data/qBittorrent/nova3/ (including the /engines sub folder) I made a back up of /share/CACHEDEV1_DATA/.qpkg/qBittorrent/.local/share/data/qBittorrent/nova3/ and the /engines sub folder. The nova3 folder had less files, so i decided to copy them from the other folder as a test. I read on some other thread about the different versions on Python so checked the nova and nova3 folders. I SSH onto the qnap to have a look through the folders where qbittorrent is installed. 4.2.2 and above the Search plugins function does not work.

Qbittorrent for android