re :How can I get a response to my questions when the replies are no-reply e-mails?

The email you received will contain a 'Post a Reply' large blue button. When you click on it, it will open a tab in your browser to the relevant question you asked, so you can then type a response. You do not use the 'reply' button to respond to the email itself.

re :I have lost my local folders when I migrated to version 68.11.0 (32 bit).

The version 68.11.0 is an old version. You mention 'migration to' : What version were you using before 68.11.0  ? Where did you get version 68.11.0 ?

In another question you said "I submitted to your blackmail and downloaded the new version."

What do you mean by 'blackmail' ? If you downloaded to the new version then you would be using 78.8.0, so this makes me wonder what operating system you are using eg: Linux ? Because it is possible to be using a version of Thunderbird which was only supplied via a Linux OS app and they are usually not up to date. Supply more info about your OS eg: Linux Mint or Ubuntu and whether your Thunderbird was something offered in some OS app or downloaded from something like a 'snap store' .

The official webpage to download Thunderbird is this: https://www.thunderbird.net/en-US/thunderbird/all/