Please re-read your prior post, wherein you were warned that going back is not recommended. It is always safer to work through issues on the upgrade than going back. Ver 115 improves with each update, and I encourage you to upgrade and work through any issues. You have the ability in settings>general to prevent automatic upgrades; that feature has always been there. I freely admit that some features are in different places, but walking through them is a one-time event.

Thank you David, but I was much happier with the older version 102; I am 82 years young and a creature of habit, I have managed to download version 102, and removed version 115 from my programs list. I will turn off all Thunderbird updates and see if that will do the trick for me.

Ok, I hope that works well. 102 was a good version. I do encourage you to do periodic backups, as reinstalling from scratch can be painful. Let me know if you need help on that.