These models were created in Blender 4.5 and 5.1 (and Up). I have GLTF, FBX and OBJ versions here as well. Of the scenes with a terrain background in it - there are two versions - one version is a simple image map for the terrain, the second version uses the same simple image map on the terrain but also has procedural pebbles and debris on the ground which can take much much longer to render if you do not have a graphics processor in your computer