Here's the ban notice for starac, the author of the mod. This basically means that it may be incompatible with mods that alter the Landscape, Trees or the LOD.
Leviathan: the cargo - ongoing series for mac. This pack overhauls the textures for Architecture, Clutter, Dawnguard, Dragonborn, Dungeons, Effects, Furniture, Landscape, Lod, Plants and Terrain. As such, this pack aims to drastically increase quality while keeping artistic look of original textures. Skyrim Realistic Overhaul contains 10gb of high quality 2048k/4096k textures and has over 1500 textures.