Ring don't work no more

HelloI have a Ring Pro, that I installed awhile back, 2017. One day my door bell started to buzz, ring and make weird sounds. I was able to trace it back to the Pro. I've disconnected it and replaced it with a basic Ring. I didn't read all the instructions while installing it, and that is when I found it needed a more powerful transformer (24VAC). My home cannot accomadate the change. Anyway, I gave it to someone who thought he could use it, turns out it wouldn't respond to his installation either. So anyone need a used Ring Pro for parts, just let me know?All parts, wire, screws, driver, etc., included.