Microsoft’s currently running Windows 10, version 1507, 1511, 1607, 1703, 1709, or version 1803, you can expect to receive a notification that states that your device must have the latest security updates installed and then offers to update your device.
This Windows 10 Version are currently at end of service. This means that devices running these operating systems no longer receive the monthly security and quality updates that contain protection from the latest security threats.