Even if you had downloaded it when it was free you would have needed to pay for it.

I think AVG Free's interface is cumbersome and has too many nag screens.

I like Avast as you don't need to do anything - it even downloads updates for you automatically!

The only action you need to do is install it and confirm what to do should you get a virus [if it detects one in something you're downloading, it will stop the download].

And my favorite feature - for home use it's free!