Microsoft stopped supporting some versions of Windows 10

Microsoft announced the end of support for Windows 10 version 1607. Devices running Windows 10 Home or Pro editions will no longer receive monthly security and quality updates that contain protection from the latest security threats. Windows 10 Enterprise and Windows 10 Education editions will receive six months of additional servicing at no cost.

Also, additional servicing for version 1511 will not extend beyond this update. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.