An automatic update has made Thunderbird unusable. I get the message Thunderbird.exe is not a valid Win32 application. On investigation it appears the latest version (60.3.0?) no longer supports Windows XP (no warning was giving when performing the download). I can download Thunderbird again (ver 38.5.0) which then wants to update to 45.8.0. That's OK but then it tries again to 60.3.0 and locks me out again! According to your website the last version to support XP is 52. How can I download this version and no later ones?