Microsoft has issued a warning for Windows users about the installation process for Windows 11 24H2, indicating that a mistake during installation could prevent devices from receiving future Windows security updates. Users installing Windows 11 24H2 with the October or November 2024 security updates via USB or external drives may disrupt Windows Update functionality, as the version is shipped without these specific patches. The issue occurs only when installation media includes these updates; devices receiving updates through the standard Windows Update process are not affected. Microsoft suggests using the Media Creation Tool to create new installation media if users encounter issues with cumulative updates after installing Windows 11 24H2. The company acknowledges that the situation affects only a small number of PCs, though the number of affected users may be higher than initially thought. Microsoft is working on a permanent solution and advises users to use the December 2024 security update to avoid complications with media-based installations.