I have noticed that while upgrading the French version from 9.1.0 to 9.2.0 but it's apparently the same in the English version. When the process of the upgrade is done the tool doesn't grey out any button or doesn't even show a pop-up to alert the user it's completed which makes it a bit confusing. The Start button (Commencer here), should at least be disabled and/or a pop-up shown to inform it's actually done. Please see the screen shot below: