For installing different versions of Windows, you need to have its separate discs for each of the version. The only difference between these discs is the presence of a configuration file called the ei ...

Windows: Windows 7 install discs are edition-specific—if you've got a valid license key, you still need the right disc for installation. The ei.cfg Removal Utility, however, lets you create a new, ...

The new computer I have came with an OEM key for Windows 10 Home in the BIOS. I have some old Windows product keys that should work to upgrade to Pro, but the installer didn't give me the option the ...