Windows version Default product key; Windows 8.1: FJWTM-42NKR-9DPD2–8FR9Y-3GMCH: Windows 8.1 Professional: B478Q-FNMXX-FKYT6-D6FC8-HMGTD: Windows 8.1 N
In order to qualify for the free upgrade, Windows 7 or Windows 8.1 with Update 1 must be installed and running. Unused licenses do not qualify. So you need to install and then upgrade the OS.An alternative is you can also directly clean install windows 10 using the ISO-make sure it is version 1511.But if you want Windows 10 for free you must do The quoted text above assumes you installed Windows 8.1 using a MSDN Windows 8.1 key, but the process still works, even if you installed Windows 8.1 with the generic key. All you do is remove the key using slmgr -cpky, restart the machine, and attempt to activate the installation and when prompted provide your actual Windows 8 license key.
After the restart you may have a Windows 10 Home edition instead of Windows 10 Pro. If so, go into Settings --> System --> About --> Change product key or upgrade your edition of Windows; Enter in your Windows 10 Pro key; The system will update and after a restart Settings --> System --> About you will see Windows 10 Professional.
Download the setups for both Windows 8 and Windows 8.1 from this page. Execute Windows8-Setup.exe. Enter your Windows 8 serial key and press Next when asked. Once the download begins, pause it and close the window using the standard X close button. Execute WindowsSetupBox.exe. 1) wipe it clean, 2) install win 8 pro (using my current retail key) 3) download in excess of 3gb to update to win 8.1 pro. 4) reinstall sql developer sku as well as countless databases. 5) reinstall vs2012. 6) reapply numerous extensions. 7) rejig vs2012 environment UI.

If you upgraded to Windows 10 or Windows 11 for free from Windows 10, Windows 7, or Windows 8.1, you should have a digital license instead of a product key. Microsoft Store App. If you bought a Windows (Windows 10 or Windows 11 Pro) upgrade in the Microsoft Store app, you'll receive a digital license instead of a product key in the confirmation

Don't worry, though, as I'll be glad to help you out as you could attempt activating your windows using the following methods: Activate by phone (IVR) using Microsoft: * Step 1 – Click on Windows Orb and enter ‘slui.exe 4’ into the search box. * Step 2 – From the search list, click on ‘slui.exe 4’.
We were able to activate a fresh Windows 11 Pro 22H2 install with a Windows 8 Pro product key as of this morning, as was Neowin. But Neowin could not activate a newer Insider Preview build of icKn.
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    • licence windows 8.1 pro key