Current ExQuilla releases
You may download the current revision of ExQuilla from these links. Make sure that you get the correct version for your platform.
To install, download and save this file. Then from Thunderbird, open Tools/Add-ons, click on the Addon tools button and select "Install Add-on From File". Install the downloaded file, then restart Thunderbird.
Beta versions of ExQuilla
You may download the most recent beta version of ExQuilla from these links:
For Thunderbird 24 and 31:
Beta Versions of Thunderbird:
Unfortunately the build environment of development versions of Thunderbird has been too unstable lately for us to support ExQuilla for beta versions of Thunderbird.