Download v60.9.1 installer from here https://archive.mozilla.org/pub/thunderbird/releases/60.9.1/win32/ then uninstall the current version via Control Panel (or Settings app). Delete the Mozilla Thunderbird folder from C:\Program Files (x86) and C:\Program Files (if it exists) then run the downloaded installer.

Well this import my existing e-mails and e-mail folders to the updated version using this process?

Well this import my existing e-mails and e-mail folders to the updated version using this process?

Yes. Just there are some changes that are needed in that earlier update. Then you will need to pass through 68 before going to 78

Worked like a champ! Thank you for the help!

Need help. Shut down computer yesterday after the upgrade to 68 and opened it up today and my email is back to factory default with no account setup and no e-mails. How do I retrieve this information?

Go to Help > Troubleshooting Information > about:profiles. How many profiles are shown?

3 Profile: default Profile: default-release Profile: default-release-1 This is the profile in use and it cannot be deleted.

I launched the 1st profile listed and that profile appears to be correct. So I'm guessing I need to select to make this profile the default. Correct?

That's correct. The "default" one is the old profile and should be made the default.

Thank you so very much for the help!

You can remove the "default-release*" ones together with their files to keep things simple and tidy. No need to keep unused profiles and their files.

Thank you for the recommendation. They had been deleted. It's working great now!