Unsolved Change Windows 10 to not use local KMS

[JaredBusch]

I have a site that will no longer be maintaining their KMS server. Mostly it was used for MS Office, and that is all O365 now. But a few Windows 10 systems are apparently talking to it.

The system does not have a Windows 10 product key. It was a Windows 7 system upgraded to Windows 10 years ago. Honestly, I have no idea how it got on the KMS server anyway.

How can I change this? I know if I had a Windows 10 key, I could just click the change product key. I'm not local and I do not want to reinstall an old system that is actually working otherwise. The time to do that is just a waste as the system will be replaced if anything happens to it.

[black3dynamite]

http://kapothi.com/switch-windows-10-license-kms-mak/

I'm not even sure this will work but try the following commands and skip step 4.
After uninstalling the KMS license, maybe running cscript slmgr.vbs /ato all you need to activate your Windows 10 upgrade license.