Ok, after much panic. I think I have 99.9% fixed. I started 5.1.1 with a blank save, and added plugins. Closed it , and transfered Content folder from my game folder to my new 5.1.1 saved folder, manually. Also overwrote DefualtInput.ini from Config folder to the new blank config. Everything seems to be working other then a few things I need to do in Project Settings.
I still think 5.1.0 should be an option to go back to on the in stall menu.