openSUSE 15.4

I installed an openSUSE 15.4 VM the other day, a message popped up which said that 15.4 was EOL - I don't recall seeing an official notice that it was. Meanwhile there are still 15.4 updates on this list, and indeed some 15.3 updates! (huh?) I needed to install the 15.4 VM because when I was still running 15.4, I screwed up my userland by booting Tumbleweed and using the 15.4 /home. KMail took grave exception to this and I lost a lot of old emails, so I want to restore a backup from before this happened, into a 15.4 userland, and get the lost emails back. Regards, Eoin