Windows 10: Does Family safety work on Free Windows 10 or require Windows 10 w product key?

My son recently sold his gaming PC and just bought a different used PC that came with a fresh Windows 10 reset/install. I'm trying to add the PC as a device to my family safety settings and not figuring it out. I'm also noticing that the seller of my son's PC did not enter a Windows 10 product key. I want to add my son's new PC as a device on Family Safety so I can limit his screen time like I did before. Does that require that I have a product key for the Windows 10 OS, or is that not the problem here? If I don't need a product key I can probably figure it out.Thank you.

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windows 10 key

Thanks but I don't want to do any decrypting. I want to download a Win 10 ISO from Microsoft and install it using my Win 8 key. No other steps required. Is that possible?

 

windows 10 key

Now that I have finally upgraded from Windows 8 to Windows 10 will my Windows 8 key work with a fresh install of Windows 10?

 

Installing Windows 10 using Windows 7 key

Nope, you need to install Windows 10 first and make sure the Windows 7 key is transferred to your Windows account after you've installed Windows 10 (not quite sure how that works). I missed the last step and I could not activate Windows 10 after a re-install... Microsoft seem to have done everything they can to make it a PITA. Also, it's technically too late to do this now anyhow, as the upgrade offer has expired. But KMSPico works quite well...

As for getting rid of Windows, delete the Windows folder.