i was a avast free user. i was given a one time offer to upgrade to avast pro for just 10$(599 INR). but they charged me16$. I find this cheating. I submitted a ticket mentioning the same and there was no response from their customer service. This is very much irritating. i hate avast now. i cudnt find the option for a refund too, very clever avast. i wont buy from u guys nor do i will recommend your product