https://www.cnet.com/news/watch-super-bowl-2019-online-patriots-vs-rams-start-time-commercials-halftime-show/

Great news You can livestream the 2019 Super Bowl on CBSSports.com or the CBS Sports app for free -- no authentication is required. You can also watch on CBS All Access if you live in one of the 200 markets where the service offers live TV. CBS All Access costs $5.99 a month, or $9.99 a month with no commercials, and offers a 7-day free trail. 

If you're willing to watch on a phone or tablet and not screencast to your TV, you can livestream the Super Bowl with the NFL Mobile app or the Yahoo Sports app for free.