It's too bad there's no way to put a text message in the banner. I think that's the 9th time today I've had to tell someone 'if your add-on stops working when you install 3.0 go to the add-on site and get the 3.0 version'.
I asked a blender SE question and then tried to ask a meta question. It said I can only post once every 40 minutes. Is that because of my low reputation? why is the time limit imposed cross SE and meta SE?