In this article, I will show you how to clear Cache and Manually Update Microsoft Defender. Windows Security intelligence updates are the latest antivirus updates for Microsoft Defender’s antimalware defence. These updates improve the capacity of Microsoft Defender Antivirus and other Microsoft antimalware products to precisely identify threats by covering the most recent threats and continuously adjusting detection algorithms. Please see How to convert distribution group to security group, and How to change Active Directory Group Scope.
This security intelligence integrates seamlessly with cloud-based security to provide quick and potent next-generation protection that is AI-enhanced.
Please see how to fix Windows Defender detects Endpoint Security HipHandlers.dll, and How to Apply and Enable Automatic Windows Admin Center Update.
What is Microsoft Defender?
Microsoft Defender, formerly known as Windows Defender and a part of Windows Security, has proven to be a powerful antivirus program for Windows 10 and 11. Therefore, if Windows Defender Antivirus is the only antivirus program you use, you should keep it updated to ensure that it can identify the most recent threats.
Learn more about Microsoft Defender: How to enable or disable Windows Defender Antivirus Periodic Scanning on Windows via Windows Security, How to restore quarantined files in Microsoft Defender Antivirus, and how to find and remove Malware with Microsoft Defender Offline.
When Microsoft Defender can’t update automatically, your computer is left open to malware intrusions. You don’t need to worry if you’re having this problem; there are a couple of different options for you to manually update Microsoft Defender.
Check if Microsoft Defender is Up to date
You must first determine whether Microsoft Defender is up to date. To check this, open Microsoft Defender, verify the current version, and then compare it with the most recent security update from Microsoft.
Press the Windows key to open the Start menu, search for Windows Security, and select the result under best match.
In the Windows Security window, click Settings, then About in the bottom-left corner.
Under System information, keep note of the Antimalware Client Version, the Engine Version, and the Antivirus Version.
Please see How to schedule Windows Defender Antivirus to scan on Windows, how to Manage Windows Defender Antivirus Through Microsoft Endpoint Manager Admin Dashboard and Intune, how to view Microsoft Defender Antivirus update details on Windows 10 image, and how to update Microsoft Defender Antivirus into the install image of Windows.
Downloads Latest security intelligence update
Go to the Microsoft Defender updates website and scroll down to the Latest security intelligence update section.
Check the Version (Antivirus Version), Engine Version, and Platform Version (Antimalware Client Version) against the ones specified in your Microsoft Defender System information.
If the versions shown under System information do not match, your antivirus must be updated. Please see how to remove the Microsoft Defender update on Windows 10 and Windows Server images.
How to Trigger a Microsoft Defender Update
If Microsoft Defender is not automatically updating, you can force it to do so by following these steps. Please see this article on All About Distributed File Systems (DFS).
Open Windows Security from the Start menu and navigate to Virus & threat protection. Under Virus & threat protection updates, click on Protection updates.
Click Check for updates, and Windows Security will try to find and download the most recent Microsoft updates.
If there is a latest update, Microsoft Defender will automatically download and install it.
Also, see how to remove Microsoft Defender update on Windows 10 and Windows Server image, and how to view Microsoft Defender Antivirus update details on Windows 10 image (install.wim).
How to clear Cache and Manually Update Microsoft Defender using Command Prompt
You can also manually initiate an update to download and apply the most recent security intelligence. To manually update Windows Defender, first clear the current cache and then initiate an update.
Press the Windows key to open the Start menu, search for cmd and run the Command Prompt as administrator.
Run the following commands one after the other.
cd %ProgramFiles%\Windows Defender
MpCmdRun.exe -removedefinitions -dynamicsignatures
MpCmdRun.exe -SignatureUpdate
How to manually download updates from Microsoft
As an alternative, you can manually download Microsoft Defender’s most recent update files on your own.
Go to the Microsoft Defender updates website and scroll down to the Manually download the update section.
Select the appropriate 32-bit or 64-bit version of the Microsoft Defender Antivirus for Windows 10 and Windows 8.1 update files.
After the update has been downloaded, run the.exe file to start updating Microsoft Defender. Here are some exciting articles: How to decide on the right File System to use for your USB, and how to fix Error – Command rejected: An interface whose trunk encapsulation is “Auto” can not be configured to “trunk” mode.
I hope you find this post helpful on how to clear Cache and Manually Update Microsoft Defender. If you have any questions, feel free to leave them in the comment section below.
