Ingame Addon Button doesn't appear

[Dezaxatul 0]

I added some addons and when I entered the game to check if they are out of date or something, no button on the left bottom area of the character selection. How can I fix that? I checked and I have 1.12.1 version. Thanks

[meridaw 11]

Close the wow client, copy the addon folder that holds the .toc file (some times this folder is inside another folder), then past it into the interface addons folder, and make sure the addon folder has the same name as the .toc file.