If you don't understand how to replace the files and don't want to look up how to, you can just download the pre-modified game in the first mega.nz linkVia DeepL:
I don't understand how to load your files into the game folder. Where do I unzip these files? I DON'T UNDERSTAND!
Also, the 4K textures were made by Goshtic, remember that.
I haven't tried it myself, but there is this Unity graphics settings plugin for BepInEx: github.com/BepInEx/BepInEx.GraphicsSettingsHow to apply ultrawide?
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If you try it, let me know how it goes.