If you are connected to the Internet, virus database updates are downloaded and installed automatically without any user action.The availability of a new version is checked when an Internet connection is established, and every four hours afterwards.
I changed it to direct connection (no proxy) and it was able to update successfully. When Avast tries to connect to its home to get the update, it may be blocked by your firewall, your Malware Bytes Anti-Malware (MBAM) ' Website Blocking', or some other protection program.
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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.
Older Avast version are still receiving the virus definitions updates, same as the latest one.