Yesterday I assembled my EleksLaser-A3 Pro and installed the EleksCAM software. I got the "Unhandled exception" error mentioned in previous posts but just hit "continue" and all seemed to work correctly after that, at least for LineByLine mode.
I did note in the LineByLine mode it tries to do the lines in alternating directions and it works fine for the left to right direction. However when it does right to left it does not reverse the order of the segments. So it does the segments left to right while drawing each segment right to left. This causes a lot of back and forth motion and a huge loss in efficiency.