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. Initially it was released with the name "Microsoft AntiSpyware" for Windows XP and Windows Server 2003 but later it was renamed to Windows Defender. Windows Defender was released for Windows XP and Server 2003 as a free antispyware program. Later it came included with Windows Vista and Windows 7 operating systems.

Microsoft has also included Windows Defender with Windows 8 and Windows 8.1 and now it provides similar protection as Microsoft Security Essentials (MSE).

But there is a small issue with Windows Defender. It downloads and installs its latest virus definition updates using "Windows Update" program. Many times users can't use Windows Update or don't want to use Windows Update, in such situations they are unable to update Windows Defender with the latest virus definition files.

There might be another situation. If you don't have an Internet connection in your computer system, you can't update Windows Defender as it requires Internet connectivity to download the virus definition files.

To overcome this problem, today in this topic we are going to share official download links for latest virus definition updates for Windows Defender program. These links will allow you to download latest virus definition files which can be stored locally on your computer system or on a USB drive. After that you can manually install those virus definition updates in your computer system or any other computer system and you'll no longer need an Internet connection or access to Windows Update to update Windows Defender.

If you also want to update Windows Defender offline and install its latest virus definition updates manually, just download them using following links:

Related: What is IA64 or Itanium-based system

Once you download the file, run the downloaded .EXE file and it'll automatically install the latest virus definition files and will update Windows Defender offline without using Internet connection or Windows Update.

NOTE: The above mentioned links should be used for Windows XP, Vista and Windows 7 only. If you are using Windows 8 or Windows 8.1, you'll need to download the virus definition updates using the links given in following tutorial as Windows Defender in Windows 8 and 8.1 uses same virus definitions as Microsoft Security Essentials program:

Download and Install Latest Virus Definition Updates Offline in Microsoft Security Essentials (MSE)


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  • It will definitely come handy in future. Thanks.

  • I have turned off windows updates and I always wanted such trick. Thank u so much VG. :D

  • I'm confused. "If you don't have an Internet connection in your computer system," why do you need protection from online viruses?

  • VG

    ^^ What about external USB drives, memory cards and software installation from CDs, etc?

  • VG, an era has ended...Windows 7 is no longer sold to retailers from microsoft.

  • @pc10282013
    actually it has not ended yet there is still alot of windows 7 dvds in stock and is still sold to oems and corporates
    btw toms hardware misreported this and they apologised later too :)

  • Downloaded file to my USB (which has Microsoft Defender Offline installed and tested)
    Ran the mpas-feX64.exe file. rebooted from USB but WDO still says definitions are out of date.
    Tried it all a second time with same result.
    Running Windows 7 Pro and 64-bit

  • Only Microsoft to name Offline and need an internet connection.

  • It doesn't work for me, when I open windows defender and checks for the version it's not updated

  • All you are damn unknown about the working of you don't have any idea that updates that are for offline install are not up to the last day you are installing for and the updates comes daily so the offline package doesn't contain all...but when you update windows defender with working internet connection after installation than it will update fastly as it will not need too much data to download as it already have some previous updates.........................


  • How to update windows defender without internet.

  • Rajesh

    All steps worth one to use. It is not abt business abt help, steps to answer in a perfect and simple way..... so that one can use.... It is to be or not to be... thats all dear developer.... not protective. If all buying why to download... all left with buy give all free .... or do not mention in capstain as free or after browsing front page.

  • We have deployed windows 7 32 bit computers without Windows Defender.
    where can I find a windows 7 Defender 32-bit installer that will put the defender back on the PC. Thanks.

  • I have windows 10 pro and i want latest definitions for win 10 defender so is this is latest for win 10 also

  • Windows Defender offline and Windows Defender Offline are two different things!! Windows Defender Offline is the program that will not update now as it has in the past. The download that you present in this article is for Windows Defender to be used OFFLINE. Has support for the Windows Defender Offline program been discontinued for machines that are running Windows 7 as their operating system. As I recall Windows AntiSpyware quit working on XP machines shortly after Windows 7 came out.

  • The previous comment by me is slightly wrong. The MSSSTOOL does properly update the definitions on the USB, however, subsequent attempts to boot from the USB and run the Windows Defender "Offline" program results in an error, that states that it is not up to date. The downloads described in this article do not provide an update for the "OFFLINE" program. It appears that something has changed in the mssstool itself or its acceptance on Windows 7 machines that prevent it from working. I have tried various versions on different machines. Both 32bit and 64bit. I noticed that one of the previous comments was also addressing the Offline program.

  • Why does Microsoft make everything so much harder than it needs to be? Only Microsoft could get away with such blatant incompetence and still be making money...

  • Clearly, the Scions of Redmond have decided to use the need to update WDO ( as opposed to the regular Windows Defender that comes bundled with the OS) as another way to force a Win 10 upgrade by disabling the necessary update when booting into Windows Defender Offline from a USB Stick. And please, before you tell me I am "damn unknown" understand that I know the difference between the OS app and the app intended to be run from a bootable USB stick, which bypasses Windows and runs as a stand-alone program to beat any malware that launches as soon as Windows does.

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