I’ve bought the Pro Antivirus on 15/10/2016 for 2 years and now is appearing a message saying that my computer is unprotected and I need “to extend my trial period for an additional 60 days of grace” being that I’ve bought it and did the installation correctly.
Did you use the license file/activation code ?
Just buying it is not enough.
Avast 2016: Inserting the license file into Avast Pro Antivirus >> https://www.avast.com/faq.php?article=AVKB8#artTitle
avast FAQ (search and find) >> https://support.avast.com/support/home
how to do videos >> https://www.avast.com/faq.php?q=video