I have not personally downloaded/tested it, so I can't speak definitively. But my UNDERSTANDING is that it is built-in to the browser (NOT a separate download). The only question in my mind is whether the VPN is automatically enabled (i.e., by default), or whether there's some opt-in option in the browser which has to be activated.
Windows 7 Pro SP1 (64-bit), avast! v17 Free, MBAM3 Pro, Windows Firewall, OpenDNS Family Shield, SpywareBlaster, MVPS HOSTS file, MBAE Premium, MCShield, WinPatrol PLUS, SAS (on-demand scanner), Zemana AntiLogger Free, IE11 & Firefox (both using WOT [IE set to WARN, FF set to BLOCK]), uBlock Origin, CryptoPrevent.
[I believe computer-users who sandbox (Sandboxie) are acting prudently.]