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Where can I find a downloadable thunderbird 38.1.0 for Mac OS 10.11.6 El Capitan?

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All the posts suggest

 Please see https://www.mozilla.org/en-US/thunderbird/all/

but that just offers the latest version (current 91.9.1) which won't run on El Capitan.

Other posts tell you to look at

 https://www.thunderbird.net/en-US/thunderbird/releases/

but that only gives you the release notes for the older versions, without any download links.

How do you get the older versions?

All the posts suggest Please see https://www.mozilla.org/en-US/thunderbird/all/ but that just offers the latest version (current 91.9.1) which won't run on El Capitan. Other posts tell you to look at https://www.thunderbird.net/en-US/thunderbird/releases/ but that only gives you the release notes for the older versions, without any download links. How do you get the older versions?

Chosen solution

The current download link is

 https://download.mozilla.org/?product=thunderbird-91.9.1-SSL&os=osx&lang=en-US

I just edited the URL in the search box, changing it to:

 https://download.mozilla.org/?product=thunderbird-38.1.0-SSL&os=osx&lang=en-US

and that gave me what I needed.

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Chosen Solution

The current download link is

 https://download.mozilla.org/?product=thunderbird-91.9.1-SSL&os=osx&lang=en-US

I just edited the URL in the search box, changing it to:

 https://download.mozilla.org/?product=thunderbird-38.1.0-SSL&os=osx&lang=en-US

and that gave me what I needed.