There are a lot of tools that will let you download and install mods for The Witcher 3: Wild Hunt. But the most popular and best-known is called MTM - Merging Texture Mods.

How does it work?

If you have multiple texture mods installed, you need to combine them to get the best results. But you need to be careful because some of them will be conflicting. If you combine them without thinking about it, you might get a bad result.

To get the best results, you need to combine them in the right way. 

What are the benefits of using MTM?

This will help you know how to circumvent the texture limit from mods by merging them.
It will help you to get the best results for your game.