The Windows 10 KB4551762 security update is reportedly failing to install and throwing 0x800f081f, 0x80004005 and 0x80240016 errors during the installation process. Users who have encountered these issues report via Microsoft’s official Feedback Hub, on the Microsoft Community website, and on Reddit. The update is an out of band security update released by Microsoft last week to patch the critical remote code execution vulnerability (CVE-2020-0796) It affects Windows 10, versions 1903 and 1909, and Windows Server Server Core installations.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4551762-security-update-fails-to-install-causes-issues/