How Does Windows 7 Anytime Upgrade Work?
One common misconception about Windows 7 Anytime Upgrade is that it requires you to download another entire version of Windows. This is not the case. Rather, Windows Anytime Upgrade downloads a couple of files at most, and unlocks certain features from your existing Windows 7 version.
If you purchased an early version of Windows 7 retail (Home Premium, Professional, Ultimate), you may have noticed that when doing a clean install, Windows asks you which version of Windows 7 you want to install. For example, if you purchased Windows 7 Home Premium, you may have been asked if you want to install Home Premium, Professional, or Ultimate when clean installing Windows 7 onto your PC. You may not have gotten this option either, but many users have reported it.
Thus, you could actually install Windows 7 Ultimate on your computer, even if your purchased Windows 7 Home Premium. The problem with this is, the activation key that came with your Windows 7 Home Premium purchase only comes with the according Home Premium key. There is no way to activate Windows 7 Ultimate, even if you did choose it as your operating system.
This is where Windows 7 Anytime Upgrade comes into play. You can use Anytime Upgrade to move from a lower version of Windows 7 to a higher version, as mentioned above. However, there is no excessive download required.