This specific 3D model, "Christmas Tree Low-poly 3D model purchase", 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".
STL (Stereolithography, filesize: 260 MB), OBJ (OBJ, filesize: 317 MB), BLEND (Blender, filesize: 312 MB), FBX (Autodesk FBX, filesize: 211 MB)