Well I was under the impression only a select users where given this for free, but a recent pop up from my free avast antivirus stated the following:
"Avast safezone browser is now free for everyone"
based on this, it seems they are giving it free to every free user, but the question to ask here, is it for a limited time? or for the entire lifetime of ur antivirus? only avast can say.
I have been with avast since the time of XP, vista, windows 7, 8 and now 10. I do find this slient install a bit rude. I agree there should have been a message box or a pop up telling you this is going to be installed. When this browser first poped up on my pc, I thought my pc downloaded a program from a url that I may have clicked on. I spent a entirer day formating my pc, doing clean installs and re-installing software on a working pc.
There were no reports on Avast's social media pages or any news they were giving i away for free. Not even a heads up by Avast saying, hey we gona give you this, ands its going to be installed on ur pc, I dont mind the slient install, Just wished avast could have informed there customers via there social media pages or on there forums if they couldnt implement a popup of some sort.