It looks like there is a version of T/Bird now for 15.3:

https://opensuse.pkgs.org/15.3/mozilla-x86_64/MozillaThunderbird-91.3.2-lp153.1.3.x86_64.rpm.html

but I can't get to a place where it will install. Brain fog, I guess. Please help!

(Have rm'd the old T'Bird and with luck it's gone.)

If I can get it working again you won't have to read email from this awful system!

Thanx--doug