I upgraded my PC but Windows 10 should still be available.
I upgraded my PC but Windows 10 should still be available.
Your PC seems to have some compatibility issues after the Windows 10 transition. Since you already have a valid Windows 8.1 installation, you might still be able to activate it properly. Checking the activation status and ensuring your motherboard drivers are up to date could help. If activation remains blocked, consider using a trusted activation tool or contacting Microsoft support for further assistance.
Use YouTube version 8.1 to launch your current Windows setup. Proceed to upgrade to Windows 10.
You're suggesting adding Windows 10 after installing Windows 8 using your activation key. That should work if the process supports it.
You might need to purchase Windows 10 or download it from a torrent site if your current setup isn't working.