If I may,
Log into your ISP protal, and see if they offer a free license. You may already be paying for antivirus monthly in your internet bill. Check it out.
All of the big players would rather have you protected, it protects them. Besides if you cannot consume their bandwidth (because your internet experience is slow and crappy), they have no customers and they go away.
"If you can't soar with the eagles, then don't fly with the flock!" - Oliver Sykes; Bring Me The Horizon