Well, what does it do? Judging from the readme file, it loads stereo cubemap and splits it in two. I can do that manually 
What I need is to show one cubemap for left eye, and another cubemap for right eye.
I am not yet too familiar with UE4 and using it for VR, so I am not really understanding the BP setup you have there. Is that a special custom material where you feed stereo cubemap and it renders left cubemap for left eye and right cubemap for right eye automatically ?
If so, do I simply make 1 sky sphere and apply that material to it ?
What if I have my cubemap already split manually, left and right eye respectively. How can I use it in this case ?