After the upgrade to the new 78, I can't send emails. They came in but kept coming up with errors when I tried to reply or send an email. As my internet connection changed over from ADSL to Fibre during the time I believed the update could have happened, I assumed it wasn't fully downloaded correctly so downloaded it again to update in the hopes all will fix itself. However, now I have no email program showing, I can't uninstall because it states that a download is in progress and needs to finish first but when clicked on it tells me, it needs to reboot to complete the download and it goes around in a circle. How do I stop Thunderbird download so it can clear itself and then reload everything back? Hopefully, all my emails etc haven't been lost.