This specific 3D model, "stairs stone wall Low-poly 3D model shop", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
OBJ (OBJ, filesize: 15.1 MB), BLEND (Blender, filesize: 15.1 MB), FBX (Autodesk FBX, filesize: 15.1 MB)