Cannot switch easily between manual download and stores has been fixed.

See more details at : https://github.com/pdulvp/jellyfin-qnap/issues/117

If you had installed jellyfin qpkg manually, and want to use the pdulvp quap store for automatic update, it is asked to uninstall first jellyfin. (which is p**). You can reconnect it manually by editing some configuration file.
See https://github.com/pdulvp/jellyfin-qnap/discussions/115#discussioncomment-11208599

Now, just launch once the jellyfin.sh manually allows this reconnection.