Erm. So you want to know how to export a Spine file into Unity?
I'm not sure what your skill level is, but if you need a tutorial to do that...What will you do after you've achieved that. Ask for a tutorial on how to make the assets into a game.
I don't have the Gunman and Hitman asset for Unity but they are clearly there to be implemented into a game that you are ready to start making yourself.
Perhaps I'm still misunderstanding your question :doh: but if you need to have absolutely everything shown to you about Gunman and Hitman, you're not going to be able to progress after that. Get your hands dirty and have fun experimenting if I were you, tutorials are mainly for helping you get started, not to do all the work for you.