Official mainstream support for Windows 10 will end on October 14, 2025. Users without the Extended Security Updates (ESU) program will not receive security updates after this date, while those enrolled in the ESU can receive critical updates until October 13, 2026. The KB5063709 update introduces an "Enroll now" button in the Windows Update section, allowing users to register for the ESU program. This update also fixes issues with the ESU logon wizard crashing and includes enhancements such as core file system optimizations, input method adjustments, secure boot improvements, and updates for mobile profile settings. KB5063709 upgrades Windows 10, version 22H2, to build number 19045.6216 and version 21H2 to build number 19044.6216. Users can register for the ESU program through a Microsoft account, Microsoft Rewards points, or a one-time fee, and those with local accounts must create a Microsoft account to enroll.