Avast Virus Definitions not Updating? Easy Hacks to Fix

Avast is the widely used anti-virus software providing the best security to internet-connected devices. However, sometimes Avast virus definitions not updated, and as a result, it will not be able to protect your system from new online threats.

Some of the common reasons for the Avast update failure are that the firewall could block the connection, you set the wrong date and time on your computer, or there’s an issue with the Avast app itself.

No matter what the reason is, let’s understand the steps to quickly fix Avast mobile virus definitions won’t update issues.

Avast virus definitions not updating

 Steps to Fix Avast Virus Definitions not Updating Error

In the rest of the content, we will discuss some easy hacks that will help you quickly fix the Avast update failed error.

Fix 1: Update Avast Antivirus Manually

avast update failed

Many times if the Avast virus definitions are outdated, you might have to deal with the error. So, first, we suggest you manually update the Avast antivirus. To do so, open Avast antivirus and tap on the menu icon. A list of options will appear on the display. From there click on the Settings option. In the Settings app, locate and open the General tab. Under the General tab, drop down and click on the Update sub-tab. Tap on Check for Update option. Wait for a couple of minutes and let the updating process complete. Reboot your system and check if the Avast mobile virus definitions won’t update messages still appear on the display or not.

You can also update the Avast antivirus from the Setup screen. For that,

  • Go to Control Panel through the Start menu
  • Under Control Panel select the Programs option and choose Programs and Features from the list of options
  • Under here you will be able to see all the installed applications. Select Avast.
  • Tap on the Change or Remove option.
  • Proceed to the Avast Setup window as well as click on the Update option
  • Follow the on-screen instructions in order to complete the process

Restart your computer and check the error status.

Fix 2: Reinstall Avast

If the above solution doesn’t work for you we suggest you reinstall the Avast antivirus. So, first, simultaneously press the Windows and R key to open the Run dialog box. After that, type ‘appwiz.cpl’ within the given field and tap on OK. This will open the Control Panel.

Within a few seconds, a list of options will appear on the screen. Choose Avast from the list. Proceed to the Setup screen and then tap on the Uninstall option. Follow the on-screen instructions to complete the uninstall procedure. Once you have successfully uninstalled the Avast app, go to the official website of Avast and download the latest version. After that check, if the Avast can’t update issue still occur or not.

Fix 3: Repair the Avast Application

avast virus definitions outdated

So you have already applied the above two solutions and are still unable to update Avast virus definitions? Then we advise you to run the in-built Avast repair tool and see if the solution works for you or not.

First, launch Avast on your computer. Head to the top-right corner and click on the Menu button. Under Menu, locate and select the Settings option. Go to the left side and click on the General tab. Under the General tab, click on the Troubleshooting option.

Under Troubleshooting, scroll down and click on the Still having Problems option. Then, tap on the Repair app option. For confirmation, click on the Yes button. When finished, reboot your computer and hope you are not dealing with the Avast antivirus not updating error anymore.

Fix 4:  Turn Off the Windows Firewall

avast mobile virus definitions won't update

As said earlier, if the windows firewall blocks the Avast antivirus, you might have to experience the error. In such a situation, we suggest you temporarily turn off the windows firewall and check if Avast can update its virus definitions. Follow the given points to temporarily turn off the windows firewall:

  • Proceed to the Control Panel and choose System & Security from the list of options
  • Click on the Windows Defender Firewall. Head to the top left corner and mark the dialog box beside the Turn Windows Defender Firewall on or off option.
  • The next thing that you have to do is to enable the Turn off Windows Defender Firewall option in both Public Network Settings and Private Network Settings. After that, click on the OK button.

Launch Avast antivirus from your device and try to manually update the Avast virus definitions.

Fix 5:  Set Date and Time Correctly

Occasionally, if you have set a wrong date and time, you can experience the Avast virus definitions not updating error. Here, we have discussed how to correctly set the date and time on a Windows 10 device. Hence first, press the Windows and I key together on the keyboard and open the Settings app. Within Settings, drop-down and click on the Time & Language option.

Go to the left column and click on the Date & Time option. After that, enable both the ‘set time zone automatically’ and ‘set time automatically option’. Close the window and reboot your device. See the error status.

Fix 6: Reset the Avast Settings

avast can't update

Remember that, Avast comes with many in-built tools and settings options and an incorrect setup can lead to the Avast can’t update error. In such a situation, we suggest you reset the Avast settings. Following are the steps that need to be followed in order to reset the Avast app.

  • Launch the Avast app from your computer.
  • Proceed to the top right corner and select Menu from the list of options
  • From there, move to the General tab and choose Troubleshooting from the left panel
  • Under Troubleshooting, drop down and click on the Reset All Settings option. Then, select the dialog box next to the Reset to Default option.
  • For confirmation, you might click on the Yes option. When finished, restart your device and see can you update the Avast virus definitions or not.

Fix 7: Contact Avast

If all the above 6 solutions don’t seem fruitful for you, we suggest you contact the Avast antivirus support team. So, at first, you need to open the Avast Support site. After that, scroll down the site and click on the Contact Us option. Choose the appropriate options on the screen and then you will be able to contact the support team of Avast.

Also read,

Easy Tips and Tricks to Cancel Avast Renewal


5 Troubleshooting Ways to Solve Avast Setup is Already Running



That’s it. We hope this guide will help you fix avast virus definitions not updating errors. However, if the error still remains unsolved, we suggest you scan your device through the in-build Microsoft Defender antivirus, and after that, the error will not irritate you anymore.

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