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How to Fix 'Avast Not Updating Virus Definitions' Issue | SOLUTION
If you use Avast as your primary antivirus tool and it does not update its virus definitions, you are risking your computer to be infected with various types of viruses and malware. This security breach is a serious problem that needs to be resolved immediately.
Some common reasons why Avast is not updating virus definitions could be that your firewall is blocking the connection, you have the wrong date and time set on your computer, or there is an issue with the Avast app itself.
Avast needs to connect to the internet to download new virus definitions. If your internet connection is inactive or unreliable, Avast may have trouble getting new virus updates.