New
#290
That's still a bit odd to be seeing it hang on multiple systems. With the beta and later RC the hang would occur at the 99% mark and then suddenly see the reverting changes message when those attempts failed on the 64bit here.
With the final version the error page now shows corrective measures that when used on the second attempt saw an immediate success without any hang at the end. The SP took a 50min. total before the restart/config began but that was it.
You likely needed to take a few preparation steps missed out on resulting in the hangs you saw in order for the smooth finish to be seen. I still have another 64bit Home Premium desktop to see updated with everything including SP1. That should go a bit faster however typically only seeing light use at that.