Well, as we wait for the devs to figure out how to do auto-updates from 102.x to 115+.x, they've released a new version, contrary to what they said a while back:
From Thunderbird.net, 02 August 2023;
"Thunderbird 102.14.0, scheduled for release on July 30, 2023, is the final release of Thunderbird 102."
Users of Thunderbird 102.13 went to 102.14 running if they accepted the update.
Now, today, 30 August 2023, this:
Thunderbird 102.15.0, is the final release of Thunderbird 102.
The Portable 102.x continues to update perfectly through the Thunderbird auto-update process.