> Thunderbird version 60.0 is only offered as direct download from thunderbird.net and not as upgrade from Thunderbird version 52 or earlier. A future version 60.1 will provide updates from earlier versions.
This means until 60.2.1, upgrades from older versions weren't fully supported by upstream. Only now it changed.
To add to above: https:/ /www.thunderbir d.net/en- US/thunderbird/ 60.0/releasenot es/
> Thunderbird version 60.0 is only offered as direct download from thunderbird.net and not as upgrade from Thunderbird version 52 or earlier. A future version 60.1 will provide updates from earlier versions.
This means until 60.2.1, upgrades from older versions weren't fully supported by upstream. Only now it changed.