I used 10.6.4-1: https://hub.docker.com/r/linuxserver/jellyfin/tags?page=1&ordering=last_updated&name=10.6.4
Copy "linuxserver/jellyfin:version-10.6.4-1" into container repository and install
https://www.reddit.com/r/unRAID/comments/8i1j2t/how_do_i_downgrade_a_docker/