[U: Microsoft Responds] New Windows Activation Bug Is Downgrading Some Windows 10 Pro Licenses to Windows 10
　2018.11.9
　https://wccftech.com/windows-10-bug-downgrading-pro-licenses-home/
.. most of these users is the fact that almost all of them had upgraded
to Windows 10 Pro using their Windows 7 or Windows 8 Professional keys.