3. Find out what type of license you have installed Microsoft describes the Windows 10 free upgrade as a full version, not a trial. Contrary to these statements, Windows 10 free upgrade does have some restrictions. If you upgraded from a retail copy of Windows 7, Windows 8 or 8.1, the Windows 10 license carries the retail rights from which it was derived – can be transferred. But under Microsoft’s rules, you are only entitled to a one time transfer. If you upgraded from an OEM Windows 7, Windows 8 or 8.1 license, these are licenses that come preinstalled on a new computer from a manufacturer, and then your Windows 10 license maintains the OEM rights – cannot be transferred. If you have a full retail copy of Windows 10, you can transfer it as many times as you want. If you performed an Easy Upgrade to the Windows 10 Pro Pack from Windows 10 Home, you can transfer it using Digital Licensing. This is possible because of the Pro Pack, while an upgrade, is a retail license attached to the Microsoft Account used to purchase it.Easy Upgrade to the Windows 10 Pro Pack

5. Press Windows key + X then click Command Prompt (Admin). At the command prompt, enter the following command: slmgr.vbs /upk. This command uninstalls the product key, which frees the license for use elsewhere.

6. Transfer Windows 10 Product Key to another Computer