Why would you want to download an unsupported and vulnerable version?

You'd be surprised - because I can minimize it to notification area and continue working on my stuff without is hanging in the task bar. And speaking about vulnerable - you've got 12 releases of 60 - how many of those contain vulnerability patches? I'd bet the next version of 60 contains vulnerability patches too, meaning the current version is vulnerable - prove me wrong. Or let's just wait for the next version and see

I can minimize it to notification area

I suppose you're using an extension for this, which stopped working in a later version? If so, you should contact the extension author.

I can ... continue working on my stuff without is hanging in the task bar.

I'm not sure how a task bar icon is preventing you from 'working on your stuff'.

I'd bet the next version of 60 contains vulnerability patches too,

I guess so. The point is, known vulnerabilities in older versions are being actively exploited. The likelihood of new (and currently unknown) vulnerabilities being exploited is low.

If so, you should contact the extension author.

I guess they just gave up fighting mozilla and don't work on this anymore. Can't blame them

I'm not sure how a task bar icon is preventing you from 'working on your stuff'.

Well, a mail client is not the most important application (as you may want to think ) - I'm not getting emails every minute. And it should sit on the background only showing notifications if an email is there. If not in the notification area - even simple Ctrl + Tab will pick mail client up and that's annoying.

Anyway, cut to the chase - is there a way to get the older version?

Warning: Installing a previous version doesn't fix most problems

Problems with an update are generally not caused by the new version of Thunderbird, but rather the update process. Installing a previous version will not help in most cases. The best option is to start a new thread about your issues, where others can suggest specific solutions.

Using old versions of Thunderbird also poses a significant security risk.

https://ftp.mozilla.org/pub/thunderbird/releases/52.9.1/win32/

You have been warned.

fzakarukam said

You'd be surprised - because I can minimize it to notification area and continue working on my stuff without is hanging in the task bar.

The modified FireTray add-on works in TB 60, if you should decide to use that version.

https://github.com/Ximi1970/FireTray/releases

Indeed, there are other addons to provide the function making downgrade unnecessary.