Microsoft bundles Windows Defender as the default antivirus in Windows 10 to provide basic security against common threats like virus, spyware, trojan and other malware. Since, Windows Defender is deeply integrated with the operating system, the virus definition updates are delivered via Windows Update. So, if you have made changes to Windows Update settings it is possible Windows Defender is not getting automatic updates regularly. You will learn how to manually update Windows Defender if your PC is online and you have disabled Windows Update. If your PC is offline, you will learn how to get Windows Defender offline update in Windows 10.
Windows Defender Fails To Update Automatically
If you have turned off Windows Update for reasons best known to you, Windows Defender will fail to get automatic updates and your system will become vulnerable to various threats. When you disable or postpone important updates, you are already putting your system in risk. Unknowingly, you are also disabling Windows Defender updates and the only option left is to manually update Windows Defender. You can do so either from within Windows Defender or by getting the updates from Microsoft. For the second method, we have earlier shown how to manually update Microsoft Security Essential using definition file or via Command Prompt. The method remains same for Windows Defender on Windows 10. You just get the definition update file from Microsoft website and update Windows Defender. You can use the downloaded update file to update other copies of Windows Defender running on offline Windows 10 PCs.
Manually Update Windows Defender in Windows 10
Manually Update Using Windows Defender Update Function (Online Update)
To launch Windows Defender, Press Windows Key + S, type Windows Defender and press Enter.
Now, click on the Update tab and click on the Update definitions button. Let Windows Defender download the latest update and install it.
Do not forget to regularly check for updates every once in a while.
Windows Defender Offline Update
You need to first find out if you are running Windows 10, 32-bit edition or 64-bit edition. To find the information, press Windows Key + S, type System, select System from the list and press Enter.
In the System window, see the System type to find out the edition. If it says x86 or 32-bit, your Windows 10 is 32-bit. If it says x64 or 64-bit, your Windows 10 is 64-bit.
Keeping this information in hand, either download the 32-bit Windows Defender definition update file from here or download the 64-bit Windows Defender definition update file from here. If you are running Windows 10 on ARM architecture, download the update from here.
After you have completed the download, you will see a file named
mpam-fe.exe, double-click on it. Follow the prompts and Windows Defender will be updated in no time. You can now do a system scan using Windows Defender. You can use the mpam-fe.exe file to update Windows Defender running on Windows 10 offline PCs. Just make sure you use the correct 32-bit file for updating 32-bit edition of Windows and 64-bit for 64-bit edition.