Navigate to the folder of your desired version (e.g., 102.15.1/ ), select your operating system (e.g., win64/ ), then choose your language (e.g., en-US/ ) to find the .exe or .dmg installer.
How to download older versions of Thunderbird - Mozilla Support thunderbird download previous versions
Older builds for legacy macOS versions (like High Sierra) can be found on MacUpdate . Why Users Downgrade Thunderbird Navigate to the folder of your desired version (e
Finding a reliable source for is essential when new updates break critical add-ons, change familiar interfaces, or introduce performance issues on older hardware. While Mozilla encourages staying on the latest version for security reasons, they maintain an extensive archive for users who need to revert. Official Sources for Previous Thunderbird Versions select your operating system (e.g.