Are you certain about this? I'd like some source from MS to understand properly otherwise it's just assumptions. You also have to remember that you only have a 30 day upgrade period after which your previous Windows version won't be valid any more, at least that is how I understand it to be. So according to the information given above, that means: 1) If you want this app you have to upgrade rather than do a clean install. 2) after 30 days you can only do a clean install and so you then lose the app anyway.