How much would it cost a non-profit to download and create something as an offering, but not make money off it?

I work for a non-profit in the education industry and am wondering if it would cost my company money to use UE4. We are hoping to create a VR game for students in the classroom and wouldn’t be making a profit. What would the pricing model (if one) look like?

UE4 is entirely free for non-profit use.