Same problem here. We are using the new Microsoft Edge. @JonathanQuinn can you please help? how can we trigger again the post upgrade window to our portal? To start the process again?
Edit: Linking another post here: Upgrade high available portal from 10.8.1 to 10.9.1 in windows
@PrasadJ we found a solution from our side. We had 2 issues:
I hope you have found a solution for your case.