It all depends on how you connect to the Internet.

Please check the following to check the settings:
Open Avast GUI > Settings > Updates >

A. Engine and Virus Definitions:

  • Automatic Update (default)
  • For “Manual” or “Ask When Update Available ” > Settings > Status Bar > Uncheck the last box

B. Update Parameters: all boxes unchecked (default)

  • If you use DSL, you may want to set #2 above to “My computer is permanently connected to the Internet.”
  • If you use dial-up, you will want to use #2 above to “I only connect to the Internet using dial-up modem.”

C. Proxy Settings: Auto Detect using IE Settings (default)

  • Some people have found that using “Direct connection / No Proxy” have worked for them.
  • Use “Specify Proxy Server” if you use a proxy and complete the information below it for the proxy server > click “OK.”

How do you connect to the Internet will depend on the above settings.