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Am I missing something or are there only "Monterail Dark" and "Monterail Full Dark" available for up-to-date versions of Thunderbird?! They seem to be maintained by the user conema. The original version (the one you linked above) which also has a light and a blue theme is not actively mantained anymore and is not compatible with Thunderbird 68.11 and probably all newer versions.
mailspring is at least OSS: https://github.com/Foundry376/Mailspring
I've been using it with the Monterail theme and quite enjoying it if that helps. :)