One more issue:
Win 8.1 pro
I went to my account area and downloaded the installer. I went to it in my downloads folder and tried to launch the .exe--it eventually launched after a long time.
Down in the system tray I see "start8 Setup." If I right-click on it I can get to the start window, but when I click on it, I get an error message from "irsetup" saying "invalid start mode archive filename" and I can't reinstall.
Advice, please?