Several Windows 11 users who installed the 24H2 update via USB or CD are experiencing issues that block future security patches. Microsoft issued a warning on Christmas Eve about a known issue affecting users who installed the October or November updates through external media, indicating that devices using this installation method may be unable to receive subsequent Windows security updates. This problem is specific to installations that included the October 2024 or November 2024 security updates. Users who updated through Windows Update or downloaded the update from the catalog are not affected. Microsoft advises against installing the 24H2 update via USB or CD and suggests affected users either wait for a fix or uninstall the update.