All versions are at https://www.thunderbird.net/en-US/thunderbird/releases/ If want to install 91, you need to downgrade ver 102, not just uninstall, and there are no guarantees. This is because profiles are not downward compatible. to do that in windows, click windows key and 'r' key and then enter in the new window: thunderbird.exe -p --allow-downgrade but be sure to back up your profile first. OR, you could be patient and 102 will get better. There have already been two maintenance releases. I respect that it can be a difficult choice. There is some risk either way when in midst of a major upgrade.

Thank you! This page is for the release notes only.

When I visit https://www.thunderbird.net/en-US/thunderbird/91.11.0/releasenotes/ and then click download TB, I'm getting version 102 again.

Oops! My error. This is the site you want: https://ftp.mozilla.org/pub/thunderbird/releases/