I've been using BitDefender free edition for a while now, and I'm mostly satisfied. I've also recommended it to others.
But in the last couple of days it keeps popping up a small window in the bottom right corner:

I understand that this is free software and I should put up with just about anything it shoves in my face, and I was patient with the first 2-3 occurences, but it seems I have to see this ad every day. I do not have an android device, and I'm not interested.
Before BitDefender free edition I used Avira free antivirus, and I switched precisely because of the nagging commercials.
The BD webpage promised just the opposite: it says "NO NAGGING COMMERCIALS".
So what's up with that?