Windows 7 Edition Switcher
As many of you already should know, Windows 7 media, as it was for Windows Vista and Windows Server 2008, includes all the versions inside the same disc. But, the difference from Vista is that Windows 7 does not let you choose from the different versions available when you install the operating system.
Windows 7 Edition Switcher will let you easily do that, and the possibility, for example, to switch from Windows 7 Home to Ultimate.
This new and simple app will let you convert any Windows 7 ISO file to the version that you need, and it only takes a few clicks.
Just select the patch from the zip file that you downloaded from the website, select the ISO file that you wish to convert and done.
Oh, did I mention this app it is also portable? 
Enjoy!
