Ensure you have downloaded the official Avast Secure Browser from the verified Avast website.
This is the most significant difference between the free version and PRO. Most browsers act like "open-plan offices" where data is visible to anyone who knows where to look, but Avast Secure Browser PRO flips that by including a built-in VPN that helps encrypt your traffic and masks your location.
Do you already have an or other Avast antivirus products installed?
: Use a single subscription to protect up to five devices simultaneously, including Windows, macOS, Android, and iOS. Understanding Avast Secure Browser PRO Activation Codes