Hi,
Downloaded free Avast AV a few days ago. Have tried a number of times to click on the green Register button.
Keep getting a weird response: “The online content is unavailable. Please check your internet connection and try again.”
This despite the fact that I am clearly connected because I’m online right now!
What to do?
Thanks!
Welcome to the forum. 
It could be referring to the avast server itself. You have 30 days to register. Try again later or tomorrow. 
Debbie