Download the latest security intelligence updates for Microsoft Defender Antivirus, Microsoft Security Essentials (MSE), System Center Endpoint Protection (SCEP) and other antimalware.

Feb 4, 2021 · This package includes monthly updates and fixes to the Microsoft Defender antimalware platform and engine that is used by Microsoft Defender Antivirus in Windows 11.

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Feb 6, 2026 · This tutorial will show you how to manually check and update the Microsoft Defender Antivirus security intelligence to the latest signature version in Windows 10 and Windows 11.

Dec 31, 2025 · It’s imperative to keep Microsoft Defender up to date even when Windows Update isn’t working. Here are several methods to manually update Defender.

3 days ago · Download the latest updates or definitions for your Microsoft Windows Defender security software. This package will help you install the latest Windows Defender definition updates.

Apr 6, 2026 · Windows Security can be updated manually in a few different ways on Windows 11 and Windows 10, and Microsoft’s own documentation confirms the most direct route is inside the app …

2 days ago · Download Windows Defender Definition Updates June 21, 2026 - Install the latest Windows Defender definition updates and make sure your computer is safe from viruses, spyware and other...

Jun 4, 2026 · Manually update Microsoft Defender in Windows 11 using Windows Update, Windows Security, direct downloads, or Command Prompt with this quick step-by-step guide.

May 14, 2026 · Learn about security intelligence updates, platform updates, and engine updates for Microsoft Defender Antivirus, including rollback and support options.