Or here: https://archive.mozilla.org/pub/thunderbird/releases/111.0b4/win64/en-US/ You can adjust the path depending on your version (e.g., win64) or your location-language (e.g., en-US).
Bug 1820351 Comment 7 Edit History
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Or here: https://archive.mozilla.org/pub/thunderbird/releases/111.0b4/win64/en-US/ You can adjust the path depending on your os type./version (e.g., win64) or your location-language (e.g., en-US).