The installation procedure is different. Please read below.
Backup your WTF folder
The zip files contains two folders:
One Addons folder: contains all the addons and they have to be copied in Interface\AddOns\
One Disks folder: contains all the virtual disks and they have to be copied in WTF\Account\XXXXXX\SavedVariables
Replace XXXXXX by your account name.
Launch the game.
Use the key shift with the mouse to move the menu icon RDX.