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由 xecutable 发表于 Sept. 6, 2017 · 永久链接

Click on the Download Anyway button. Get the file. Open the file with your favorite Zip program. Edit the file install.rdf. Find the Thunderbird maxVersion: 38 and change it to a number higher than the current version.

For example I changed it to 58. Update the archive. Go to your addons tab, and click on the wheel and select install Addon from a file. Done. The installation starts and works.