TL;DR: Unblock Twitch from anywhere in the world with a VPN. The best service for unblocking Twitch is ExpressVPN.
Twitch is probably not banned in your location, but imagine for a second that you're traveling to a place without access. That's a scary thought, but there is a quick fix to sort this problem. VPNs can be used to secure access to Twitch from anywhere in the world, and you don't need to spend anything.
If you're looking for the best way to unblock Twitch for free from anywhere in the world...