Use https://github.com/ww-rm/SpineViewer if you want to view the animations (Note that you must have the .atlas, .json and .png in the same folder for this to work and edit the .atlas to support the .png in it).

Also side note for Chief Bogo when loaded in, his sprite will be invisible and that's simply because in Skin, only the default button is on while hero/hero-flip is off, which makes the model invisible.