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If you want to add activation key code on Avast antivirus, first you need to know which type of version you are using free or paid. No matter you are using a free or paid version of Avast, it is necessary to have a license to use the program although the process of license differs depending upon the version you use. To activate the software, you can locate the activation code at different places depending on the method of purchase. You can receive it in an order confirmation email, on an activation card, or within another Avast product. To know more visit us.