Yes. You can find all versions here: https://archive.mozilla.org/pub/thunderbird/releases/ Scroll to find the version number you want, click, then pick Win32/64, click, then pick language version, and so on, until you see the _______.exe file. Click. Install the new version in the same directory you used for the old one. Before you launch the just-installed version, go in to your latest-date profile and delete ''compatibilty.ini''. Launch.