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Can I still get version 45.8.0? I cannot get a legacy management system to integrate with new version.

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I have an older management system that would integrate with T-Bird Email client version 45.8.0. It will not integrate with the most recent version of T-Bird that was updated in error. I need to go back to version 45.8.0. Where can I obtain an the older version of T-Bird?

I have an older management system that would integrate with T-Bird Email client version 45.8.0. It will not integrate with the most recent version of T-Bird that was updated in error. I need to go back to version 45.8.0. Where can I obtain an the older version of T-Bird?

Chosen solution

The Windows version of TB 45.8, all languages, is here:

https://archive.mozilla.org/pub/thunderbird/releases/45.8.0/win32/

If you ran TB 68 on the profile that you wish to use with 45, you may receive an error like the attached picture. In that case, Exit, and start TB 45 from the command line: Windowskey+R, then type

thunderbird.exe -p --allow-downgrade

to start Profile Manager, then select the desired profile, probably named default. If you wish to create a new profile for 45, the --allow switch is not needed.

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Chosen Solution

The Windows version of TB 45.8, all languages, is here:

https://archive.mozilla.org/pub/thunderbird/releases/45.8.0/win32/

If you ran TB 68 on the profile that you wish to use with 45, you may receive an error like the attached picture. In that case, Exit, and start TB 45 from the command line: Windowskey+R, then type

thunderbird.exe -p --allow-downgrade

to start Profile Manager, then select the desired profile, probably named default. If you wish to create a new profile for 45, the --allow switch is not needed.