There are times when it is important to determine what version of Windows Defender is currently installed in Windows 10 so you can diagnose a problem or determine if you have the latest version installed.
Unfortunately, Microsoft does not make it very clear how to find this information. This tutorial aims to clear up that confusion.
To find the version number for the installed Windows Defender in Windows 10, please follow these steps:
From the Start Menu, search for Windows Security and click on the result when it appears as shown below.
Searching for Windows Security
When Windows Security opens, click on the Settings gear at the bottom left of the Window as indicated by the arrow in the image below.
Windows Security Screen
When the Settings screen opens, click on the About link as shown below.
Windows Security Settings Screen
The Windows Security About page will now be open and will show the Antimalware Client Version (Windows Defender version), the Engine version (Scanning Engine), the Antivirus version (Virus definitions), and the Antispyware version (Spyware definitions).
The Windows Security About page showing version info
When done using this page, you can simply close the Window.
For most users, the Antimalware Client version is what you are looking for as it will indicate the overall version for Windows Defender installed in Windows.