I purchased a copy of Windows 7 professional on-line and downloaded the setup file. When I opened it I was told that: 'to upgrade from one version of Windows 7 to another you need to use Windows anytime upgrade' or something to that effect. So I went to windows anytime upgrade and click on 'I have already purchased a copy of windows 7', then I was prompted to enter the upgrade key. I just entered the Product key because as far as I am aware I haven't got an upgrade key.
The upgrade worked so I assumed I had done the right thing. Can any one confirm that the upgrade key is the same as the product key?