I just checked with my close friend, who works with Unity and the current game engine I am using, which is Copper Cube 6 has the capacity to be played on the lowest end PC's. Once again, I retried the files and they all look fine. Unfortunate, that it does not work for you. Sorry again.
Yes, it's very unfortunate. Because, I did open up your Youtube channel, which is amazing, btw, just great content, so, I did see you play couple of games and I did notice some of them were UE games and if those games run on your PC, I would be very surprised that this one does not, because Copper Cube 6 can run on a very low end PC, as I mentioned in the previous comments, because it has older rendering system, like one that Half Life games and early 2010s games had.
Well, either way, thanks for checking it out and giving it a try. Cheers!