If you want a STEP file, I can give you a STEP file but I have lost my faith recently in them.
I have an open issue with them in the private PowerUser forum. (You could see that if you were a PU 
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Also, you could much more easily see your surface mesh issues with a quick download of the mesh and in ParaView extract the surface like I showed above in my CyberTruck tread images
Use this trick to be able to view HEXpara meshes easily in ParaView 