New
#11
It would be impractical for MS to have a different KB number for each new signature update, they typically issue at least two or three every day.
If you check for updates in Windows Security it will show you the version number and creation date of your current signature update, and the date Defender last checked for updates. The latest signatures are currently version 1.309.1457.0.
If you are still having trouble getting an update, you can download a standalone installer for the current signatures from Microsoft. They are available for different versions of Windows and in 32-bit or 64-bit. Make sure you click the appropriate link for your system.
https://www.microsoft.com/en-us/wdsi/defenderupdatesMicrosoft said: