Rated 2 out of 5 stars

After a day of struggling with new TB 78.4.3 (64-bit) and this Add-On 78.0.1, I found this solution, which worked for me. In TB Calendar TAB:
1. Unsubscribe from your Google Calendar
2. Remove the Add-On "Provider for Google Calendar"
3. Reinstall a brand new Add-On "Provider for Google Calendar"
4. Resubscribe to your Google Calendar
5. Reboot TB

This review is for a previous version of the add-on (78.0.1).