Upon leaving BETA 0.16 & returning to 1.15.9 MCPE crashes

I was a tester for 0.16. I decided I wnted to play Realms so I left the BETA program. I uninstalled & reinstalled MCPE. When I tried to open MCPE it would not open. It only crashed. I checked the forums for this issue & found MANY people were having the same problem. They'd been in BETA & left to return to 1.15.9 with the saame results. No one seems to have any ideas or suggestions on how to fix this issue. It must be a bug.