Important: To ensure that the antivirus engine receives updates to protect you from the latest threats you must connect to the Internet.
Being offline does lower the risk to your computer, but it also exposes your system to threats from removable drives and by using outdated virus definitions.
The benefits of being online include the following:
When offline Avast can still perform Full System, Removable Volume and Customs scans. Avast then reports threats and recommends actions to neutralize them.
To run a scan do the following: