Make sure you have all version of wow installed, otherwise manually create these folders in your WoW director and try again

  1. <your path>\World of Warcraft\_retail_\Interface\AddOns\
  2. <your path>\World of Warcraft\_classic_\Interface\AddOns\
  3. <your path>\World of Warcraft\_classic_era_\Interface\AddOns\

Posted in: Installation Questions