The OEM 8.1 has not been used and it there fore has NOT been registered at Microsoft. To do what you want to do, you need to install the 8.1 Pro on this machine, activate it. BUT, remember my statement about W10 hardware. Then you should be able to get the free upgrade to 10 Pro installed.

Free Windows 8.1 product keys. How to activate Windows 8 and 8.1 a product key. Method 1. Use an automated script. Method 2. Manually activate Windows. Purchase Windows 8 and 8.1 for cheap. Free product keys have been around for decades. Some people want to try the system to its fullest before making a purchase.
If you enter a VLK key for Windows 10 Pro on Windows 10 Home, it will not be accepted. What you can do is enter the Windows 10 Pro upgrade key, VK7JG-NPHTM-C97JM-9MPGT-3V66T, let it upgrade, and then enter the VLK. Unable to upgrade with the “upgrade key”
Torquemada. "The basic process is that when you perform an upgrade to Windows 10 (over a genuine Windows 7 or 8.1 system), an anonymous and unique hardware hash is generated that is based on your systems hardware configuration. Since it is anonymous, you do not have to use a Microsoft Account. This hardware hash is generated even if you choose
It includes key Windows 8 Pro functionality plus Embedded-specific technologies. It also has enterprise features disabled the OEM version that can be activated through Volume Licensing. (Note: There is no version 8.1 of this product.) Windows Embedded 8.1 Pro . A full edition of Windows 8.1 Pro distributed through the
But it is much easier to download Windows 8.1. We just need to visit this page from a Windows PC, scroll down and click on the "Download Tool Now" button. This will download the Media Creation Tool application, which is about 1,5MB. We run it and select the language, the edition, and the architecture.

1 day ago · Windows 10 Pro: W269N-WFGWX-YVC9B-4J6C9-T83GX: Windows 10 Pro N: MH37W-N47XK-V7XM9-C7227-GCQG9: Windows 10 Pro for Workstations: NRG8B-VKK3Q-CXVCJ-9G2XF-6Q84J: Windows 10 Pro N for Workstations: 9FNHH-K3HBT-3W4TD-6383H-6XYWF: Windows 10 S: Windows 10 Education: NW6C2-QMPVW-D7KKK-3GKT6-VCFB2: Windows 10 Education N: 2WH4N-8QGBV-H22JP-CT43Q-MDWWJ

How to transfer Windows 8/8.1 license to new computer. Note: This Windows 8.1 installation media accepts Windows 8/8.1 product keys, both OEM and retail (for example, "Windows 8 Pro $15/$40 Upgrade Offer" product key). 1. Create installation media for Windows 8.1. - The Windows Installation Media Creation Tool works on Windows 7/8/8.1/10. Windows 8, 8.1, and 10 users can use the Windows Key + X shortcut, then select Command Prompt (Admin). Other users can type CMD in the Start menu search bar, then press Shift + Ctrl + Enter. Now copy and paste the following command, replacing the number [#] signs with your own product key, and press Enter: CIN8Go7.
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    • licence windows 8.1 pro key