W3EE Redux is a mod designed to make a set of tweaks and modifications for the great W3EE (5.03). It has also included a new toxicity system, dozens of new enchantments, updated skills, and alchemy items, reworked witcher gear and relic swords, new set bonuses, and many small balance changes such as Relic Swords, Skills, Injuries, Difficulty Settings, Tweaks - Gameplay, 
Tweaks - Quality of Life, Enemies & AI, Addons: 'Gaunter Mode', Addons: 'Seasoned Witcher Mode', and so much more.

To install, you will need to extract the mod into your main Witcher 3 directory. Also, there are two other options to resolve conflict within the mod.

Option 1 is to cut the modReduxW3EE/content/scripts folder and paste it into modW3EE/content.

Option 2 is to run Script Merger.