Warlord titan printing questions

I am not asking for titan files just to be clear. I got my hands on some but am now very confused and not sure where to start. There is 3 zips, one with a versions a, b, c. Then there is a second zip with just b, c. Then there is a third zip with just c.

Each zip has different files and I'm not sure if the different versions mean completely different models or if it's just a step 123 kind of thing. Any tips or help would be much appreciated.