Not a warning, just a friendly little ad or reminder of a feature, is this normal behavior?
Hi EmoHobo 
I have really no idea what you are talking about.
Can you provide a screenshot of such a pop-up ?
Greetz, Red.
I actually can’t get it to happen after the update.
Are you sure it is avast ?
Just a guess…
You need to fill in a captcha…
If so, that is caused by a wrong detection from Google.
If you read the message it clearly says why it is showed to you.