One cannot say that The Witcher 3: Wild Hunt is an ugly or unfinished game. Nonetheless, even though the game is beautiful, and some sceneries are breathtaking, it does not mean that the game developed by CD Projekt RED cannot be even more stunning. The creator of The Witcher 3 HD Reworked Projects has decided to make it possible.
The author has implemented into the game numerous high-quality textures and ensured proper optimization, thus improving the visuals should not trim on the game's performance. The changes have affected many objects, however, the biggest improvements are visible in the details - the brick walls of Novigrad, floors, roofs, crates, sacks laying around the villages, and tables placed in the houses. The Witcher 3 HD Reworked Projects also takes care of the landscape by improving the textures of rocks, trees, and the bed. All this looks perfect, and the exploration becomes even more pleasant than it was before.
This modification can be installed either manually or using Nexus Mod Manager. In the former case, it is enough to unpack the downloaded archive and move the modHDReworkedPrjects folder to the Mod catalog in the game's main folder.
When choosing the 4K textures, you have to do one additional thing in order for the mod to work properly. You have to navigate to the Mods/modHDReworkedProjects folder. From there, copy the bin catalog and paste it into the game's main folder (replace all the necessary files).