Install hang, Win 7 Pro, 64 bit. Found solution
I ran into a problem with the installer hanging when it got to where it said, "computing space requirements". It would just sit there, doing nothing. After more than one hour trying to figure it out, I started closing apps, to see if there were interactions. (Visual Studio, etc.) When I closed Google Chrome, the install then came to life and finished.
So, do not have Google Chrome open when installing, for better success.