I got an email from Avira, but I never downloaded any of their products

Hey guys, I wasn't sure where to post this but I wanted some feedback. So I got an email today from Avira saying "Thank you for downloading one of our trial products, etc", I don't recall putting in my email address and downloading anything, especially recently. Is it possible someone used my email address when they downloaded it? Did a bot just take my email address and sign me up? Am I being paranoid?

I just wanted to see what you guys had to say, has this happened to any of you?