[Addons] Transfering addons configurations

Today I was watching this video and I really wanted to try out this UI. I then downloaded the addon package the owner shared to me.
To apply the same configurations someone else has, as far as I know, you have to copy the WTF and Addons folder (this package also includes a "Fonts/" folder) and then change to the correct name the folders required - those being ACCOUNTNAME, SERVERNAME and CharacterName. This way, as I understand it, the game thinks that the configuration preexists for your character and then it's applied to it.

But, no matter how hard I try, after spelling it all correctly my game will NOT load the configuration and will start with everything messed up (default configurations).

Any idea why and how I can fix this? I attach some screenshoots:

https://i.imgur.com/th8CVPh.png
https://i.imgur.com/l8ZWtOI.png (I have also tried with the first letter in caps, only)
https://i.imgur.com/asXiIEL.jpg

did you solve it? doesnt work for me either :'(