Microsoft continually updates security intelligence in antimalware products to cover the latest threats and to constantly tweak detection logic, enhancing the ability of Windows Defender Antivirus and other Microsoft antimalware solutions to accurately identify threats. This security intelligence works directly with cloud-based protection to deliver fast and powerful AI-enhanced, next-generation protection.
Microsoft security intelligence updates include software that incorporates material from third parties. Third-party notices and information
Automatic updates
If you want to update Windows Defender manually in Windows 10/8/7 using the offline installer of its definition updates file, mpam-fe.exe, read this post. How to Update Windows Defender Offline? Install Latest Virus Definition Files Manually - Windows Defender is a free anti-malware tool from Microsoft which can be used to improve your computer system security.
To help ensure your antimalware solution detects the latest threats, get updates automatically as part of Windows Update. If you are having problems with Windows Update, use the troubleshooter.
Original Title - WINDOWS DEFENDER. Does the 'latest' WINDOWS DEFENDER DEFINITION UPDATE super-cede all previous updates? Two DEFINITION Updates (May 2 - 2013; May 11 - 2013) FAILED to be installed by Windows Automatic Updates. I am now instructed to MANUALLY Install these Definitions. I do not know HOW to MANUALLY Install these Definitions.
If you don't already use Windows Defender Antivirus, learn how to turn it on.
Trigger an update
A manually triggered update immediately downloads and applies the latest security intelligence. 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.
In Windows 10, select Check for updates in the Windows Security Virus & threat protection screen to check for the latest updates.
Enterprise administrators can also push updates to devices in their network. To clear the current cache and trigger an update, use a batch script that runs the following commands as an administrator:
Manually download the update
You can manually download the latest update.
Latest security intelligence update
The latest security intelligence update is:
- Version: 1.303.908.0
- Released: 10/5/2019 2:22:54 AM
- Documentation: Release notes
Manually Download Windows Defender Update Error 0x80070643
You need to download different security intelligence files for different products and platforms. Select the version that matches your Windows operating system or the environment where you will apply the update.
Manually Download And Install Windows Defender Updates
| Windows Defender Antivirus for Windows 10 and Windows 8.1 | 32-bit | 64-bit | ARM |
| Microsoft Security Essentials | 32-bit | 64-bit |
| Windows Defender in Windows 7 and Windows Vista | 32-bit | 64-bit |
| Microsoft Diagnostics and Recovery Toolset (DaRT) | 32-bit | 64-bit |
| Forefront Server Security | 32-bit | 64-bit |
| Forefront Endpoint Protection | 32-bit | 64-bit |
| System Center 2012 Configuration Manager | 32-bit | 64-bit |
| System Center 2012 Endpoint Protection | 32-bit | 64-bit |
| Windows Intune | 32-bit | 64-bit |
The links point to an executable file named mpam-fe.exe, mpam-feX64.exe, or mpas-fe.exe (used by older antispyware solutions). Simply launch the file to manually install the latest security intelligence.
End of life for Microsoft Forefront Client Security was on July 14, 2015. Customers are encouraged to migrate to System Center Endpoint Protection. For more information, visit the Microsoft support lifecycle website.
Network Inspection System updates
The following products leverage Network Inspection System (NIS) updates:
- Microsoft Security Essentials
- Forefront Endpoint Protection
- System Center 2012 Endpoint Protection
Manually Download Windows 10 Defender Updates
These updates are designed to protect you from network threats, including exploits as they are transmitted. Check the version of the Antimalware Client component on your security software and download the right version of the NIS updates for your platform.
| 4.1.522.0 and newer | Network Real-time Inspection definitions | 32-bit | 64-bit |
This package will help you install the latest Windows Defender definition updates. Windows Defender is a free program that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. It features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected and minimizes interruptions and helps you stay productive.
How to download and install a Microsoft Windows Defender update:
How To Update Windows Defender
- Check whether your version of Windows is 32-bit or 64-bit.
- In the table left, click on the link that will work for your version of Windows.
- Save the file to your Desktop.
- When the file has finished downloading, go to your Desktop and double-click the file dowloaded (it will be called win10-mpam-fe-x64.exe, win10-mpam-fe-x86.exe or similar).
- Follow the prompts to install the update.
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