The March 2019 patches are also rolling out to PCs with Windows 7 and 8.1. The new monthly rollups for Windows 7 comes with general security fixes and improvements. The latest patches address an issue that may prevent the Event Viewer from showing some event descriptions for network interface cards (NIC) You can download and install the latest patches by checking for updates in Control Panel. Alternatively, you can also install them manually by downloading the package from the Microsoft Update website. After installing this update, Internet Explorer 10 may have authentication issues.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-7-kb4489878-and-windows-81-kb4489881-released/