How do I open the game?
Open the WindowsNoEditor folder and there should be a file called TrainSet, double click that (the Application with the little U icon, not the folder called TrainSet)
The program can't start because XAPOFX1_5.dll is missing from your computer. Try reinstalling the program to fix this problem.
This indicates your version of DirectX might be old or have issues. Reinstalling the latest version should solve it. Here is a thread covering the problem which may help you.
I'm still trying to determine how exactly to fix this. This thread might help you: https://answers.unrealengine.com/questions/354251/vcruntime140dll-is-missing-error.html