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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 4 Home - registration number
 I have registered to use your Avast 4 Home version, and have got my registration number. Unfortunately, I don't know what to do with it now.SolutionYou have to
 avast! 4 Home edition - license key
 I have "avast! 4 Home Edition" installed on my home computers and have entered the same license key on all of them. Does using the same license key on more than one computer harm the avast! functionality or updating capabilities in any way?
 Definition of commercial in the sense of non-commercial use of avast! Home Edition?
 What is the definition of "commercial" in the sense of non-commercial use of avast! Home Edition?Solution"Commercial", using our definition, means ANY work done for a commercial aim (money is not t
 error:
 I have successfully registered to use your avast! antivirus program, and I received the activation key without any problems. However, when I try to enter the key, the program says "Invalid license number". Why?Solution
 I have purchased a license from avast! via the web, but the invoice told me I had purchased an MP3Download Manager and other products. How do I get a refund?
 I have purchased a license from avast! via the web, but the invoice told me I had purchased an MP3Download Manager and other products. How do I get a refund?SolutionYou have searched for an antivirus solution via the
 I have purchased a Lifetime or Gold License package
 How toI have purchased a Lifetime or Gold License package Solutionavast! is reporting that my license has expired, but I have just recently purchased a "Lifetime
 I haven't received the license key
 I haven't received the license key, why is this?SolutionThe distribution of license keys is an automatic process, nobody decides whether to send or not send the key. Here are the most common reasons for not receiving
 Inserting the license key into avast! Home Edition or avast! Professional Edition
 Language|Česky|
 License key appears to be too long
 I have received my license key by e-mail, but when I try to insert it into the program, as shown in the instructional video, it appears to be too long for the space available; what can I do?SolutionThis problem normal
 Message: 'The license key is an illegal or pirated'.
 Issue Illegal license key - I have received a message that the license key I am using is an illegal or pirated key. What do I need to do?Details
 My licence key has expired, what should I do?
 My licence key has expired, what should I do?SolutionFirst, check your license key validity. You can do it this way: Right-click on the blue a-ball icon in system tray. Select "About avast!..
 My license was temporarily disabled
 A red box warns me that my license was temporarily disabled – what does it mean?SolutionThis may happen when avast! detects a manipulation with system date. Please set a correct system date and insert your license key
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