No matter what I try, I cannot setup my existing email accounts since the last upgrade (**.*.*) Just installed Ver. **.*.* and still cannot connect to the server.

GetHuman5875391's Setup service issue with Thunderbird from March 2021

Help with my Thunderbird issue
The issue in GetHuman5875391's own words
I was trying to set up the program for my two email addresses. ... After Thunderbird did an update to Ver. **.*.*, I cannot access the ISP'S server ever thought after filling out all my information in the setup process, it found all of my settings on the giver server. After selecting DONE to get on the server, the error message that comes up says: Unable to log in at server. Probably wrong configuration, username or password. *I called my ISP and they confirmed that all of the information I entered into the 'Set Up Your Existing Email Address' is correct and so is my email address and password.*I can get my webmail to come up at my ISP's website but cannot login to the same server that I entered into the Set Up window. Could you help me with my problem?
What they show on their support page does not match was comes up on my computer when I try to set up my present email accounts that have always been working.
Allow me to get into my email accounts.
I have been a user ever since thunderbird came out.
I finally got to talk with a technician that knew what was going on. She told me that they discontinued the use of the servers that I connected to, to get my emails for my two accounts. I was able to finally get the emails that are on the ISP's servers, but no contact information. Checked my version of Thunderbird that I now have and it is version **.* (**-bit) I would like to go back to an older version with the hopes of getting back all of the emails, contacts, and folders that I saved emails to. I have older versions downloaded but don't know how to install them and be able to stop auto-update from changing to the newest version. I have to get back all of the previous records of my contacts and emails in order to be able to send out emails to someone in my contact list.*Any help would be appreciated..
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Thunderbird

Thunderbird **.*.* (Mozilla email program)
Setup service issue
Reported by GetHuman5875391
Mar 22nd, 2021 - 2 months ago
Not resolved
Seen by 18 customers so far
Similar issue to 160 others
0 customers following this
Items needed
Account holder name
Account number
Billing address
Last 4 digits of Social Security number

Timeline

GetHuman5875391 started working on this issue
Mar 22nd 8:14pm
GetHuman5875391 indicated the issue is not fixed yet.
Mar 23rd 3:46pm
GetHuman5875391 indicated the issue is not fixed yet.
Mar 23rd 4:18pm
GetHuman5875391 indicated the issue is not fixed yet.
Mar 25th 6:49pm
GetHuman5875391 indicated the issue is not fixed yet.
Mar 25th 6:52pm
GetHuman5875391 shared this issue with friends on Facebook
Mar 25th 8:13pm
GetHuman5875391 indicated the issue is not fixed yet.
Mar 25th 8:16pm
GetHuman5875391 indicated the issue is not fixed yet.
Apr 12th 7:42pm