Liamponage :
ur6beersaway :
Win-8 goes first & activate, then win-8.1 preview. Win-8.1 final comes out on OCT 17th.
It said on the website you can download windows 8.1 preview on windows 7
Yes. it also said a lot of other things like "This is a preview" and "If you decide that you want to install Windows 8.1 Preview using the ISO, you won't be able to uninstall it. If you decide to go back to your previous operating system, you'll need to reinstall it using the recovery or installation media that came with your PC, which is typically DVD media."
http://windows.microsoft.com/en-us/windows-8/preview-iso
Moving from the Preview will almost certainly entail a new install.
Moving from Win8 to Win 8.1 will (supposedly) be a free, easy upgrade,