You place the turnout, then place a matching lever / rail combo. I think there's a readme in the file if you open it for edit. Unfortunately, they relied on an unsupported feature of Trainz, and therefore only work in versions before TRS2004.
As they will not work after UTC, why did Auran include them for update? Similarly for Mike10's turnouts. It seems it was just an automatic cull without any human intervention or have Auran a suprise up their sleeve and they are going to work again. (looks into the sky for pigs!)
I was looking at Elvenor's turnouts when I was removing the errors. I might be able to get them to work again, but they would have fixed levers (and would infringe on Max's copyright.)