I think this a 64-bit build? If so, is there a 32-bit build anywhere?
Sorry for being awkward, my kids are pretty keen to give this a go, but they have 32-bit windows on their gaming tablets (I think it will probably run ok, they can just about run Slime Rancher, and Rocket League runs ok in a fairly pixelly mode).
Ah, you said you were looking for a mac tester: I've got a 2009 MacBook that can run Chaos Reborn and my own Unity 3D projects, I'd be happy to try it out for you with my PS4 controller.