The guy that hired me wasn't sure which version they have, as he isn't one of the engineers. He said it was "relatively recent" but not as new as 2017, which I also have. Figured I'd go through the 2015 version and the 2015 Essentials book for now so I don't just spin my wheels and shoot in the dark my first day. I'll find out which version they use tomorrow, and go from there.