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The knowledgebase is organized into different categories; please select a category that you are interested in. You can also search the entire knowledgebase by entering keywords in the navigation bar beside this text.

 Articles
 avast! and firewall software
 What should I know about using avast! 4 in combination with a firewall?SolutionYou may receive warnings from your firewall once you install avast!, because avast! tries to connect to our servers to look for virus defi
 Error message:
 Whilst trying to update avast!, I get an error message stating: "Server is down". How can I resolve this problem?SolutionIf you see this error message whenever you try to update manually, check if:
 How do I upgrade from avast! Home to avast! Professional?
 How do I upgrade from avast! Home to avast! Professional?SolutionFirst, there is no need to uninstall your Home edition. To upgrade, you have to buy the Professional edition first. Once you b
 Last encountered error: The package is broken
 A red box has appeared on my screen saying: "Last encountered error: The package is broken." What should I do now?SolutionFirst, try to update the avast! program manually. If the manual update complete
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