Ok. It actually worked fine, and did say Done!, but I checked and I removed it duplicating at top (above files) and bottom. But I should have removed it from Top, not from Bottom. Fixed.
Confirmed on wwsu1069.org . Again, done! appears at the top and not the bottom. However, it may be because 10RC19 has the fix, but obviously the fix is not applied until after the upgrader completes.
(Click to enlarge)