If you have been in the World of Warcraft Classic beta test through your account administration page, you may want to check the BattleNet launcher to see if it has been selected. The beta servers are currently open and lead players to play the highly anticipated reboot or "vanilla" WoW.
Go to the BattleNet World of Warcraft page and download below the video on the left side under Region / Account, click on the drop-down menu and click on Beta: Classic. If it is selected, you will see the Install button. (Yes … yes, I've been chosen!)
Twitch where Classic is trend.
For those who have not yet done so, go to your Beta profile settings page and check the box next to "World of Warcraft Classic" to become a potential tester.