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V91.3.0 Requires Account Setup

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Auto update to V91.3.0 took place yesterday. Now, Thunderbird wants me to setup an existing email address, but nothing changed with my email address and login. Where have my TB accounts gone? How do I get them back? Or, can I undo the version update?

Auto update to V91.3.0 took place yesterday. Now, Thunderbird wants me to setup an existing email address, but nothing changed with my email address and login. Where have my TB accounts gone? How do I get them back? Or, can I undo the version update?
Attached screenshots

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It is 2 years since I wrote this. It's need is still current. I assume it will help you get back to your original profile. https://thunderbirdtweaks.blogspot.com/2019/09/i-lost-my-profilemail-on-update-to.html

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Thanks Matt. I'll give it a try.