I presume you want version 115.13. That is at https://ftp.mozilla.org/pub/thunderbird/releases/115.13.0/ Just pick the desired version, such as Linux, win32 or win64 and then pick the language. Download over the current version. Then, check for a compatibilities.ini file in the resulting profile and delete it. However, if the concerns are minor, it may be better to stay and work through them, as 128 will be receiving regular updates.

My biggest issue is that the old versions diverted all the spam and junk to a junk folder.. I have looked everywhere I can think of to set this up and cannot find a solution.. I do not want to have to look/read every single email thats comes in to a mail box.. In the old versions there were steps in the mailbox setup to route and handle junk.. I can't find anything in this version. Thanks

I looked at prior versions and did not see anything specific. In 'junk settings' you can change the folder to use a spam folder. That might work if you are already sending spam to a spam folder and would keep both spam and junk together. Another approach might be to have a filter moving spam to the junk folder.