The Zip File includes 3 Files. "Airfield2.blend" is the origin file where you can make changes. Day and Night are presets for Night or Day renders. Everything is Blender Internal. So basicly it's just a texture pack, but i decided to build a simple scene to see how they can be used. all textures are CC0 (zero) and i built them al by myself. So what textures do you get? corrugated metal, brushed metal, fence, tree, stoneplate (most of them with normal and spec color maps). i brighten up the Night scene a bit for the Preview here (because it's a small picture). most of the textures are greyscale, so you can change the color of them with the Diffuse Color.