The key must only be used with a fresh install of Windows 10 Pro, and cannot be used to upgrade from Win 7, Win 8 or Win 10 home to Pro.

Activate using a product key

A product key is a 25-character code, that looks like this:

     PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

During installation, you’ll be prompted to enter a product key.  Or, after installation, to enter the product key, select the Start  button, and then select Settings  > Update & Security  > Activation  > Update product key > Change product key.

Windows 10 Pro official download link:

https://www.microsoft.com/en-gb/software-download/windows10

If you have any issues, do not hesitate to contact us, simply send us a screenshot of the error / error code and we will help you.