Rod_Stokes, I understand your frustration
I was having the exact, same issue. I tried to open Zwift and it required me to update. I clicked “UPDATE.” When Google Play opened I had 2 options: “Uninstall” or “Open.” I clicked “OPEN”; Zwift said I needed an UPDATE. After going back and forth on this several times I began to feel like the butt of an elementary school joke, “How do you keep a moron busy? Turn this page over.”
I was able to update immediately on my computer.
I did just now uninstall and reinstall the app on my phone and it did work. I hate to suggest trying it again - but that’s what I’m suggesting - give it another chance. Hope you are able to get it resolved.