@StéphaneC
Actually, I already tried using the Flow saved in that zip file and got an error even before running. I updated the flow with my information, but when I look at the summary page for the imported Flow, I see the error: There's a problem with the Flow's trigger. Fix the trigger
And when I click on it, it gives me some garbage about not being able to find the calendar in the 'When an event is changed' trigger, which is described as "This operation triggers a Flow when an event is added, updated or deleted in a calendar."

I'm guessing the trigger being used is DEPRECATED. I can add in the latest version of this trigger (When an event is added, updated or deleted (V2)), but I cannot delete the bad trigger without breaking the Flow. So this packaged Flow does not work, and I cannot easily fix it.