After updateing to a new version of Thunderbird my old profile has disappeared

Did you install from the Microsoft store? Look in Users\username\AppData\Local\packages\MozillaThunderbird.MZLA_h5892qc0xkpca\LocalCache\Roaming\Thunderbird\

If it's there, I suggest reinstalling from the thunderbird.net site and transfering the profile.

I installed from thunderbird.net. It is not where you suggested. Any other ideas please.

can you do a screenprint of the appdata\roaming\thunderbird\profiles folder?? Also, a screenprint of the contents of appdata\roaming\thunderbird\profiles.ini will be helpful. Thanks.

Requested screen shots added below. Cheers

The profile.ini indicates there is only one profile and it is set to default. There is no indication of a missing profile. I am clueless on what may have happened.

With default-release in profiles.ini, there should be a directory for that. That said, what files are in fu0hnlmc.default?

Very strange! I would try the following: Press Windows Key + R on the keyboard. In the Run dialog box, type: thunderbird -P The Thunderbird profile manager will open: select the profile "default" and click "Start Thunderbird" Report what you will see....