Does this URL help? https://www.thunderbird.net/uk/

Here is the Windows installer for the latest nightly in Ukrainian:

https://archive.mozilla.org/pub/thunderbird/nightly/2023/04/2023-04-12-10-30-24-comm-central-l10n/thunderbird-114.0a1.uk.win64.installer.exe

if you ever want the Release then you can download the current Thunderbird Release in Ukrainian locale on https://www.thunderbird.net/thunderbird/all/#uk

To use different languages of Dictionaries see https://support.mozilla.org/en-US/kb/how-install-and-use-another-language-dictionary-th

On the same Add-ons page for the dictionaries there is also Language Packs as that can be a way to switch the User Interface or UI in multiple languages with one install.

Here is the Windows installer for the latest nightly in Ukrainian: https://archive.mozilla.org/pub/thunderbird/nightly/2023/04/2023-04-12-10-30-24-comm-central-l10n/thunderbird-114.0a1.uk.win64.installer.exe

Дякую, це саме те що треба! Thank you, this is exactly what is needed! Page with the program (nightly test builds) for 2023 https://archive.mozilla.org/pub/thunderbird/nightly/2023/

It is strange that the Thunderbird website offers a test assembly of the program in only one language??? https://www.thunderbird.net/uk/thunderbird/beta/all/ https://www.thunderbird.net/uk/thunderbird/beta/all/ It is surprising that earlier on the Thunderbird website, the test assembly of the program was offered only in English. Now I went to the site and the link goes to the assembly with Ukrainian localization. Or I didn't look at the language of the site ( In general, it is bad that there is no multilingual assembly.

sfhowes сказав(-ла)

Here is the Windows installer for the latest nightly in Ukrainian: https://archive.mozilla.org/pub/thunderbird/nightly/2023/04/2023-04-12-10-30-24-comm-central-l10n/thunderbird-114.0a1.uk.win64.installer.exe

It is surprising that earlier on the Thunderbird website, the test assembly of the program was offered only in English.

What do you mean "test assembly"?

If you mean, advertize a page that lists all the languages for Daily builds, it doesn't really make sense because localization is constanly out of date with dailies. But that's generally not true of betas https://www.thunderbird.net/en-US/thunderbird/beta/all/