THis URL has all varieties for you: https://ftp.mozilla.org/pub/thunderbird/releases/68.12.1/

Thanks for the quick reply, David. But I can't figure out from that URL how to download that version. Can you help further, please?

Ok. for example, if you have Windows 64-bit PC, click the win64 link. Then, if you speak US English, click en-US. Then doubleclick the Exe file and it will download.

Thanks again, David. But now another problem. After the download, my computer says "The app you're trying to install isn't a Microsoft-verified app." The only way seems to be "Change my recommendation settings" but that takes me to Settings > Apps > Installed apps which does not seem to help. I've downloaded on a new Windows 11 S-mode computer. I'll hunt around Microsoft Help (generally pretty useless!) but I thought you may have encountered this before and know what to do. Thanks.

• Windows in S mode won't let me install Firefox
• Windows 10 warns me to use a "Microsoft-verified" app

i had suggested the exe version. Try the msi version, as I think that works with Microsoft. I'm puzzled about your problem, as I regularly use exe. All I can guess is that the world has changed since that version changed.

Thanks, David and TyDraniu. The problem was S-mode in Win 11 -- after a few false rabbit holes, I finally found out how to get out of S-mode and into normal Win 11 -- and I've now downloaded and installed Tbird. What a business! Bloody Microsoft again!!

I'm glad all is well. :)