Avast virus definitions or sometimes called VPS (vpsupd.exe) basically tells antivirus which files/websites are malicious. Based on them program is blocking opening of dangerous files or URLs. So it is extremely important to keep it updated to the latest version. Otherwise your computer can potentially get infected and antivirus won’t help you.

Sometimes Avast may also block safe programs or websites because of the out-dated virus definitions. That’s so-called false-positive detection.

Major updates to Avast virus definitions are usually released daily, while the smaller ones are delivered constantly throughout the day via the streaming updates.

By default all Avast antivirus solutions (Free Antivirus, Pro Antivirus, Internet Security and Premier) are downloading the virus definitions updates automatically when your computer has access to the Internet. When this happens you will also get a pop-up notification saying ‘Your virus definitions have been automatically updated‘.

Avast Virus Definitions Update Pop-up NotificationAvast Virus Definitions Update Pop-up Notification

But sometimes you need to update virus definitions on a computer which has no Internet access at all. Such computer can still get infected from the external devices like USB flash drive or CD/DVD. Therefore it is important to keep the virus definitions up-to-date. Follow the steps below to learn how to do it manually on the offline machine.

1. Download the Latest Avast Virus Definitions (VPS) Offline Update for Free

First of all you need to download the latest update of virus definitions (VPS). Those updates are regularly published for all Avast versions, including the old ones from v4.8 to 2016. Select the version and download the free update using the links below (downloaded from the official Avast servers):

File name vpsupd.exe

File name vpsupd.exe

File name vpsupd4.exe

If you are not sure about which version of Avast you are using, go to Avast settings » ‘Update‘ and check the number. The first number is the major version which translates as follows

  • 11.x.xxxx is version 2016
  • 10.x.xxxx is version 2015
  • 9.x.xxxx is version 2014
  • 5.x.xxxx (or 6, 7, 8) is version 5 (or 6, 7, 8)
  • 4.8.xxxx is version v4.8 (Avast Home Edition)

2. Transfer the Downloaded Virus Definitions File to Offline Computer with Avast

Once you download the latest update of virus definitions simply put it on some external device like USB drive, CD/DVD or external hard disk. Then you need to download the file from the external device to offline computer where Avast is installed.

File name of the virus definitions update is always the same – vpsupd.exe or vpsupd.exe for v4.8.

3. Update the Virus Definitions Manually on the Offline Computer with Avast

After you copy the file with virus definitions to the offline machine where Avast is installed, just run the file and that’s all. Avast will do the rest automatically and update itself from the file. When the process is finished you should get a confirmation ‘The product has been successfully updated‘.

Avast Virus Definitions Manual/Offline Update FinishedAvast Virus Definitions Manual/Offline Update Finished

As mentioned at the beginning new Avast virus definitions are released daily, but of course you don’t need to update it on the offline computer every day. Once in a week is fine, once in a two weeks is also sufficient.

How to Update Avast Virus Definitions Manually

If you want to make sure your Avast virus definitions are up-to-date you can also update them manually on the computer with Internet connection. You can either find Avast icon in the Windows system tray and click on ‘Update‘ » ‘Engine and virus definitions‘ (see the image below).

Update Avast Virus Definitions Manually from the Windows SystrayUpdate Avast Virus Definitions Manually from the Windows Systray

Or open Avast and go to ‘SETTINGS‘ » ‘Update‘ and click on ‘Update‘ in the ‘VIRUS DEFINITIONS‘ section (see the image below).

Update Avast Virus Definitions Manually from the Program InterfaceUpdate Avast Virus Definitions Manually from the Program Interface

How to Switch Avast to Manual/Automatic/Ask when available Virus Definitions Updates

By default Avast is downloading virus definitions automatically. In case you want to change settings to manual updates or asking when available, go to ‘SETTINGS‘ » ‘Update‘ and click on ‘Settings’ in the ‘VIRUS DEFINITIONS‘ section (see the image above).

You can chose from following update options:

  • Automatic update – Virus definitions are download automatically when they are released. Typically this happens when you are starting your computer but it can make your Windows boot really slow. If your system is taking ages to load, check our full guide ‘Avast Performance Tips: How to Speed Up Your Computer and Windows Startup (Boot)‘ on how to boost performance
  • Ask when an update is available – You will get a pop-up notification informing you about the available virus definitions update (see the image below). Then you can update them with one click
  • Manual update – You won’t get any notification about the new updates and always you need to perform a manual update of virus definitions (see the section above for details)
  • Enable streaming updates – If checked (recommended) Avast is downloading so-called streaming (minor) updates throughout the day

New Avast Virus Definitions Update is Available Pop-up NotificationNew Avast Virus Definitions Update is Available Pop-up Notification

Additional Notes

Although we have used Avast Free Antivirus 2016 screenshots in this article, these steps are also applicable for all Avast Antivirus solutions (i.e. also for Avast Pro Antivirus, Avast Internet Security, or Avast Premier) running the latest version available.

Steps are relevant for all Windows versions – Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10 (including Anniversary Update).

Looking for information how to update Avast version? Check out our how-to guide on Avast program update – How to Update Your Avast Antivirus 2016 for Free or Download the Avast 2016 Offline Update Files.

Written by Paul B. | Team GetAvast.net

My name is Paul and I love Avast since the Home Edition v4.8 (2008). I am recommending it to all my friends, but I realized they don't know how to use it. So I started this site in order to help others getting maximum from this awesome antivirus. Feel free to contact me via Facebook, comments below or this form.

This article has 8 comments | Did we miss anything? Just let us know in the comments!

  1. Barbara Glover Reply

    Good afternoon,

    I need you to alter the way Avast is working on my computer in that it is blocking sites I wish to use. Can you please stop this procedure?

    Many thanks,

    Barbara Glover

  2. Les Jepson Reply

    I am still using Windows XP and the version of avast i am using is avast 10.4.2233 definitions files (current version) 150917-2. Release date 17/09/2015. It says latest update received 20/07/2016 at 15:25:20 I have tried manually updating it actually says it is updating but does not update left computer on all night next morning it still says updating but nothing has changed, Can you help, Regards Les Jepson

  3. kate Reply

    I cannot get into my Outlook account – it is stating i need to update the add in “avast” or uninstall it . for the Outlook to gain access again . there is no record of “avast” in my files or programs to either update or uninstall ? How do i fix this problem ?

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