It does work on windows 10.
I think it's just a limitation with your current hardware, I'm sorry, on this case there isn't much we can do =(
given the games he can play I think thats a very lazy answer no offense. I understand the woes of games of game development, but I definantly think there is more you can do to improve game performance. Also a side not just becuase unreal takes certain specs to run doesnt mean that is what your game will take to run. Could be more could be less.