Windows 8.1 Download Media OEM Install Guide Windows 8.1 Download Media OEM Install Guide Jun 6, 2015 windows 8 Windows 8.1 Clean Install OEM This product key cannot be used to install a retail version of Windows 8 Downloadable Media Downloadable Software Step #1 Get the MSDM key Download get_win8key Naviate to get-win8key folder Click on File > Open Command Prompt as Administrator Type get_win8key.