I have the same problem on a Win 8.1 PC even without closing my browser. It works fine on my Win 7 64 bit PC with emulation of Win 7 x64 and 2 GB of RAM. In Win 8.1 I tried emulating Win 7 64 bit with 2 GB of RAM is seemed to install until I clicked the "Update" button. Five hours later it was still busy installing so I shut it down.
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