deos installing unreal engine on pc improves the gaemplay in a pc ?
No idea what you mean yet I’m still certain the answer is ‘no’. So, no.
Other than that, you may need to clarify what you really mean.
I guess he is having trouble with a game that being developed by UE4. By that he may think if he install UE4 on system, he could play game without problem 
Makes sense. Still, I want to say no? But who knows. If you’re despearate, anything goes.
If you install unity and unreal engine together, you can have better performance for all the game universe 
Lets not miss cryengine too