Bassna - I appreciate your feedback and effort. I was able to slice the STL file you posted OK with Kisslicer. It says it will take 21 hrs. to print so I am going to start that now.

Up to now I've been using Craftware as my primary slicer because it has, in my opinion, the best user interface and provides the most detail about what the results of slicing actually are. Craftware has known errors which are supposedly being fixed in the next release so hopefully I will be able to slice my models when it comes out.