I need the old thunderbird version 91.13.1 but I don't know how to downgrade the current version 115.5.0.
Does anybody know?
Are you sure you want to use an outdated version of Thunderbird?
https://archive.mozilla.org/pub/thunderbird/releases/91.13.1/
sudo apt-get remove thunderbird
Use the tar command to extract the downloaded tarball:
tar -xvf thunderbird-91.13.1.tar.bz2
sudo mv thunderbird /opt/
sudo ln -s /opt/thunderbird/thunderbird /usr/local/bin/
That should suffice for my comprehension...
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How did you install Thunderbird?
Here is the source file - I have searched the web and cannot find a .deb package for 91.13.1... I can find 91.8... The Mozilla Website will only offer the latest as a downloadable .deb which was infuriating.
https://sourceforge.net/projects/portableapps/files/Source/Thunderbird/thunderbird-91.13.1.source.tar.xz/download
Please remember to first uninstall/remove Thunderbird. Once your preferred version is installed, remember to mark it as held:
sudo apt-mark hold thunderbird
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Another option you might want to try is Betterbird. I replaced Thunderbird after the last upgrades caused me problems. Betterbird loads much faster and so far since I started using it a couple of months ago I have had no problems with it at all. It is in the software store for Z17. You can import your profile from Thunderbird into Betterbird.
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First of all, thanks a lot for your help!
I installed it via that software app.
I've know uninstalled thunderbird but now I'd have a question.
Does that "thunderbird-91.13.1.source" folder have a file I have to click for starting the installation. I've got almost no experience in Linux.
If not, could you tell me what I have to do for installation?
Hi Inzingor,
thanks a lot for your help.
I did as you said. The old version is gone. As far as I can judge it all the commands where executed but no thunderbird was installed.
Do you have a hint for me what I've done wrong?
EDIT: Hold off on this post in light of @Inzingor's post below...
The first command that @Inzingor posted extracts the compressed file.
The second moves the "thunderbird" directory to the Root /opt directory.
The third command creates a symlink from that file to the Root Binary Directory. (This action should cause it to appear in the app menu... But let's test it below)
What you can do to test:
Elevate to root
sudo -i
Launch the file manager for Zorin Core
nautilus
or for Zorin Lite
thunar
Navigate to /usr/local/bin/ and scroll down to the Thunderbird file (ot tap into the open window thunder... and it should move to and highlight that file)
Double click it to launch it.
If it launches Thunderbird, then it is successfully installed.
In which case, all you need is a Desktop File for it to be added to /usr/share/applications in order for it to appear in your App Menu.
Upon my attempt to install it myself, I've already identified errors. The command 'sudo mv thunderbird /opt/' is meant to move the 'thunderbird' folder into the '/opt/' directory and not its contents.
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Have you also installed other software or files in /opt?
@Aravisian Does Zorin OS install relevant things in /opt, considering that, to my knowledge, it's meant only for optional or third-party software?
If there are no crucial files in that directory, you can clear it using that command, while ensuring that the /thunderbird directory in /opt remains unaffected.
sudo rm -r /opt/*
Let's summarize:
Download the desired version of Thunderbird. Directory Listing: /pub/thunderbird/releases/91.13.1/
cd Downloads
tar -xvf thunderbird-91.13.1.tar.bz2
sudo mv thunderbird /opt/thunderbird
sudo ln -s /opt/thunderbird/thunderbird /usr/local/bin/
thunderbird
Have a blast with numerous security vulnerabilities. 
And finally, I would like to emphasize once again not to engage in such actions and to regularly update your software, as updates are usually not released for fun. But to each their own...
The Zorin Operating System does not install any files in /opt although installers for independent software can and will. For example, Brave Browser or Vivaldi Browser will self-install in /opt.
There can be good reasons to hold back a package. A Newer release may contain a bug or even a vulnerability of its own. Some new release packages can contain not only regressions, but bugs that make the app non-functional.
In a perfect world, all Latest Releases would be safe and patched and have no problems. In reality... an older and stable or working package is often the better way to go.
This is often a case-by-case basis and this is true on Windows, Mac and GnuLinux.
These can be discussed for informed decision making by the users.
The release of Thunderbird packaging may need examination and @citfta's excellent advise above should not be neglected.
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