Hello All
Ok first download the 3 files below
wow.bat
Arctium WoW Client Launcher.exe
Config2.wtf
Put file wow.bat and Arctium WoW Client Launcher.exe into your Battle for Azeroth folder
Put file Config2.wtf into your Battle for Azeroth/WTF folder
Make a shortcut from wow.bat to your desktop
Run wow.bat from your desktop
log in with the same info as your Legion
If you dont have a Legion account. Create on here
http://www.crypthome.com/wow8/