Microsoft support said they know about the problem and work to fix the error.
The users noticed a mistake Microsoft activation servers.
On some computers running Windows 10 Pro, the operating system reported that the Windows 10 Pro license was turned off and prompted users to install Windows 10 Home.
During the diagnosis, a license conflict was discovered because the installation of Windows 10 Pro is trying to work with a Windows 10 Home license. In that case, the user must either change the operating system to the home version or purchase a Pro version key. Attempting to purchase a Windows 10 Pro key in the app store does not resolve the issue.
Microsoft Support said they are aware of the problem and are working to fix a bug related to some type of malware on the activation server. The company confirmed that some Windows 10 Pro systems, like Windows 10 Enterprise, did not recognize the previously activated license.
This problem was met by users in Russia, Japan, USA, Korea and other countries. Microsoft has promised to resolve the issue within 24 hours, and computers with Windows 10 Pro will automatically get an action.
Remember it Microsoft recalled the latest Windows update after removing user files.