Textures are 1024x1024 and were originally made for legacy shaders (phong). Some months later after the original release of this asset, everything was converted to PBR (Standard Specular).
Altough this model was not initially designed for PBR, it looks nice inside the Unity3D Engine. If you are planning to use it for Unreal Engine, keep in mind that you will have to convert the textures from Specular workflow to Metallic.
Take a look at the screenshots and download the promotional video to see the animations.