Looking at your test file: Did you add a Light Importance volume?
This is important because your test machine is significantly lower in spec than your developer machine and is, in fact, below recommend minimum spec for running UE4 (which is typically a good indicator of minimal specs of your end user machine unless you are making a very basic game like a 2D game, etc) This would account for why the game runs fine on your Dev machine and not your test machine.
Also, in the packaged folder on your test machine there should be game log in the following location:
WindowsNoEditor/ProjectName/Saved/Logs = ProjectName.log
Please recheck this location and post the log from the test machine after a crash if present.