Upgrading Windows 7 Home Premium to Windows 7 Ultimate

Scuzz

Today I was tasked with upgrading some Windows 7 Home Premium PCs to Windows 7 Ultimate.

For some reason the installer will not let you upgrade from Home premium to Ultimate and it tries to force you to do a clean install.

I managed to find a way around this by editing some registry keys.

Open Regedit and navigate to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion

And change:

EditionID from HomePremium to Enterprise

and

ProductName from Windows 7 HomePremium to Enterprise

Then re run your upgrade and everything should run as you expected!