For downloading meshes you need to put the files in your my_objects folder. (FeralHeart > Media > Objects> My_Objects) And with some meshes, in order for you to use it you must go into your object maker and type in the .mesh and the .material files. Try that and see if it works, but if it doesn't you could always read the "Read Me" file if it's included in the download. (Unfortunately Adfly is being a butt, so I can't exactly see what you're trying to download, sorry.)