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Usually, you can do following:

- Install Windows retail SKU, but do not activate it. You can borrow disk or download ISO for this. - Start installing upgrade version, then reformat partition, supplying upgrade key in the process.

At the end, you will have Windows upgrade installed and activated, fully functional.

discuss

SquareWheel|13 years ago

Wait, you install the old Windows version, then the upgrade, and then reformat? That doesn't sound right to me...

anotherblue|13 years ago

No. If you have any Windows installed on the machine, then you just start upgrade process from it, then after EULA screen, you choose Custom Installation and then reformat the disk and continue with installation.

For Windows 7, if you have machine with empty disk, then you start installation of upgrade version, but do not provide product key and uncheck 'Activate' checkbox. This will install Windows in trial mode. Then, start upgrade setup again and let it 'upgrade' OS... After that, you have activated Windows on the machine.

For Windows 8, I am not sure if process of double installation will work.