Sorry... how do I "Install" it. I just got a .zip files with all the addon´s files inside. Thta´s ok, but where do i put them? I tried to locate the file you say inside the file inside "savedvariable" and it doesn´t exist either.
Install means activating it in your addons when you start up WoW. After you copied the folder into your addons folder, just start the game, check if the addon is active, then close the game. After this, the lua file will be in the described WTF folder.