Fix for Diablo 3 install error: "Could not Install. Invalid Installation Options"

The fix was quite simple. If you are trying to install the digital version of Diablo 3 that you download right from your Battle.Net account and you get this error:

Take the Diablo-III-Setup-enUS.exe and simply move it and place it in C:\Program Files.

Run it again and accept all defaults. Problem solved.