Windows 11 24H2 Home and Pro reached end of updates on October 13, 2026, so those PCs no longer get security fixes.
Version 26H2 is supported until October 10, 2028, which is 363 days longer than 25H2, and all three versions share the same platform.
A build number starting 26100 means 24H2, 26200 means 25H2 and 26300 means 26H2, and Enterprise 24H2 keeps updates until October 12, 2027.