This is the core addon

LUI is a Next Generation World of Warcraft User Interface dedicated to replace the standard Blizzard UI in a way you cannot imagine. I'm very proud to present you LUI v3 one of the most advanced and elaborate User Interfaces ever made. This project was first engineered by Loui, who has decided to step down and has evolved to have a development team. The rest of the development team is still working on this project, with his approval.

Main Features of LUI v3:

Full automatic installation
Support for all addons, you can disable built-in features, add, remove or replace addons and everything should still work!
Support for all resolutions from 1280 pixels in width up to 1920
Over 200 Textures that will make your WoW look better than ever before.
Option Panel with more than 3000 possibilities to make your UI unique.

Installation:

Download Bundle from WoWInterface
(Optional) Rename your WTF and Interface folders to keep a backup of your old UI.
Put the contents from the zip file in your "World of Warcraft\_classic_\Interface" folder -- for Mists of Panderia[1]
Start WoW
Enable all Addons
Click Install
Enjoy!

[1] "World of Warcraft\_classic_era_\Interface" folder -- for Classic

Extra features: If you want wow buttons to have the LUI Flavor that it had before such as the black menu buttons and the square checkboxes, follow these steps:

Make sure WoW isnt open
Go in the Interface \ AddOns \ LUI \ Media folder.
Copy the BUTTONS and GLUES folders to the Interface folder in your WoW Directory (right next to the AddOns folder)
Start WoW
Enjoy!

Questions/Support regarding LUI for Classic, visit the Github Page or visit the main LUI discord

This has been updated for Classic era and Mists of Pandaria

Lui v3 WoW-Classic