When we use those "FREE" online software downloads, they have to have a way to do a "got'ya" to make serving up things for free in the first place. Not only does using it invite malware, PUP's and other intrusive matter, its a back door for marketing to do their dirty deeds and all without you consenting. PLEASE read the two stories linked below for some enlightening information on the subject.
https://www.vice.com/en_us/article/qjdkq7/avast-antivirus-sells-user-browsing-data-investigation
https://www.pcmag.com/news/the-cost-of-avasts-free-antivirus-companies-can-spy-on-your-clicks
Cheers