Avast Internet Security is a (with a free trial, typically 30 days). You can download the official free trial from Avast’s website , but there is no legal “free forever” version of the Internet Security edition. Avast does offer a permanently free product called Avast Free Antivirus , which has fewer features (no firewall, no advanced ransomware protection, no anti-spam, etc.).
It sounds like you’re looking for a of Avast Internet Security — but I should first clarify: avast internet security software free download