Avast Virus Definitions Update Failed Error Easy Fix

The Avast virus definitions update failed error usually occurs when trying to update the virus definitions of the desktop version of the app. It’s usually caused by a corrupted data or outdated app version. To fix this you will need to perform a series of troubleshooting steps.

Avast is a popular antivirus software that’s available for Windows, macOS, iOS, and Android. It’s available in a free and paid version, both of which can effectively safeguard your data against unauthorized access. It can detect and remove any malware and other threats making it one of the most highly recommended third party antivirus solutions.

Cannot update the virus definitions of Avast

If you are using Avast for your computer antivirus protection then one of the things you must keep in mind is to regularly check for any new antivirus definitions. This is the database of virus types that the antivirus software uses to detect threats to your system. Sometimes an error will occur when trying to download this database. Here’s what you need to do to fix this.

Things to do first:

  • Restart the computer and router that it is connected to. You should consider unplugging the power cord of both devices then plugging it after a few moments.

Method 1: Update the Avast application

One factor that can cause this issue is an outdated app. Try getting the latest app update to fix this problem.

Time needed: 5 minutes.

Update Avast app

  1. Open the Avast Antivirus program.

    You can do this by clicking on it from the Start menu list of applications.Fix Avast Virus Definitions Update Failed Error

  2. Click on Menu.

    This has the icon of three horizontal lines on the upper right side of the app.Cannot update the virus definitions of Avast

  3. Click on Settings.

    This opens the various app settings which you can manage.click on settings

  4. Make sure to be on the General tab then click on Update.

    This will open the app update settings.click on update

  5. Click on Check for updates.

    Click on the application update button, usually the second one.click on check for updates

After the update has been applied try checking if the issue still occurs.

Method 2: Repair the Avast app to fix virus definitions update fail error

There are instances when a corrupted file in the app can cause this problem. To fix this all you need to do is to repair the app.

  • Open the Avast Antivirus program. 
  • Click on Menu.
  • Click on Settings.
  • Click on the General tab.
  • Click on Troubleshooting.
  • Click on Repair app.
  • Click on Yes. 

Once the repair has completed try to check if the problem still occurs.

After performing the steps listed above you will successfully fix the Avast virus definitions update failed error.

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