Provider for Google Calendar is not working for me in Thunderbird 78.7.0. Meetings appear on the wrong dates. If I unsubscribe and resubscribe, the meetings appear on the correct dates, but eventually they jump back to the wrong dates. (They jump back to the wrong dates immediately if I click "Synchronize Calendars".)
I see that Provider for Google Calendar is specified only for versions of Thunderbird through 78.2.0. I am willing to revert to that version, but I don't know how. Can anyone point me to a page where I can download that version of Thunderbird?