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 the Mage creep when loaded in, its invisible because in Skins, the blue_skin/magenta_skin is off and turning on any of them will display the model.