
This will not work if you use an OEM or system builders product key If you have a folder named Download in the same folder (ex: on desktop), then you will need to rename it before running the mediacreationtool.exe file to avoid it and it's contents from being permanently deleted.

When you run the mediacreationtool.exe file below it will permanently delete any folder named Download and it's contents that's in the same folder as the mediacreationtool.exe file. The Windows 8 or 8.1 product key embedded in the UEFI firmware of the OEM PC will be automatically detected and used during installation to activate Windows 8.1. If you have an OEM Windows 8 or 8.1 PC, then you will also be able to use this ISO to install and activate Windows 8.1 if you are installing the same edition of Windows the key is for. If you have a retail Windows 8 or 8.1 PC, then you will still need to have a valid Windows 8 or 8.1 product key to be able to install and activate Windows 8.1. This option allows you to download the latest Windows 8.1 ISO file without needing a product key.

OPTION ONE Download Windows 8.1 Update ISO File with "Windows Installation Media Creation Tool"
