Manualy updating windows defender
As the Windows Defender AV client is installed as a core part of Windows 10, traditional deployment of a client to your endpoints does not apply.
However, in most cases you will still need to enable the protection service on your endpoints with System Center Configuration Manager, Microsoft Intune, Azure Security Center, or Group Policy Objects, which is described in the following table.
Pre-release definitions are partially tested definitions that can be installed manually only.
They include the newest publicly available definitions.
While the client is installed as a core part of Windows 10, and traditional deployment does not apply, you will still need to enable the client on your endpoints with System Center Configuration Manager, Microsoft Intune, or Group Policy Objects.
There are two parts to updating Windows Defender Antivirus: updating the client on endpoints (product updates), and updating definitions (protection updates).
Right-click on the Start Menu button to open the Win X Menu.
In the Win X Menu, click on Command Prompt (Admin) to open an elevated Command Prompt.
You must disable or uninstall third-party antivirus products before Windows Defender Antivirus will be functioning.In Windows 10, select Enterprise administrators can also push updates to endpoints in their network.To clear the definitions cache and trigger an update, use a batch script to run the following commands as an administrator: You need to download different definition files for different products and platforms.This process might also address problems with automatic updates.Windows Defender Antivirus and other Microsoft antimalware solutions provide a way to manually trigger an update.
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If you re-enable or install third-party antivirus products, then Windows 10 will automatically disable Windows Defender Antivirus.