The texture is 1K because its enough for the size of the mesh it is applied to. In comparision the vanilla texture is 512.
To install it just extract the content to Skyrim main folder (where the TESV.exe is located).
MY OTHER MODS
Skyrim Project Optimization: What it does is to use occlusions to optimize and improve performance on interiors .
Remove Interior Fog V2: What it does is to remove the ambient fog on all interiors, making them darker and more realistic.
Improved Vanilla Mountains HD: A texture improvement for the vanilla mountains/rocks textures.
Salmon Texture HD: A retexture of the Salmon fish.
DONT FORGET TO ENDORSE IF YOU LIKE!