[Arongranberg A * Pathfinding Project] How to move units without overlaping of them?

I have a few units that move between the obstacles in place a mouse click. Movement is a simple change of coordinates in go.transform.position. I have these objects "overlap" on each other. In search of solutions found in the official documentation of the demo: http://arongranberg.com/astar/webplayer?p=penalties But did not find where I could download this scene. It would be grateful if someone explained why in the demo bots are following each other, not on each other - without overlaping or would share the link to this or a similar example in which one could see how it works.