Id just like to share my solution to the time my ANT + died on the day of the update for the Alpe D’Huez.
If your ANT+ Stick worked yesterday but not today and your PC recognises it with the sound of connecting USB or disconnecting.
But when you get to the pair page on Zwift - Nothing.
Open Device Manager on your PC
My Ant+ stick was under “unknown device”
But I unplugged it to see which one disappeared out the list so I knew which one to click on.
Click on the one you think your ANT+ stick is.
And it should come up with “update driver over the internet” or update via Files.
Click on the internet one - Wait - et voila ,mine worked again.
I have the cheapest ANT+ dongle possible.
But when it stopped working I hastily bought a new one only to find it didn’t work either.
If this is you - follow these steps.
I’m only posting this because this method is not on Zwifts official guide.
I hope this helps someone.