I read all vendor’s the instructions. They are for Win only. I have read other threads here, but they do not tell me how to enter the license # that was sent to me when I bought the program. How do I enter the license #?
Avast for Mac uses a License file that you are sent when you buy the program. You enter it by selecting License from the avast menu and then navigating to the license file on your Hard Disk
More details about various “license-not-ok” cases are here:
http://forum.avast.com/index.php?topic=34084.0
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