I have a mac build, but it's so poorly optimised. How fancy is this mac of yours? Specs if you can get them. It nearly killed mine, but mine is a solid few years old now. I'd have to find a way to privately send it to people, as i don't have the confidence in its functionality to throw it up for download.
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The fact that it has 1gb of Nvidia Geforce graphics might give it a bit of an edge here in comparison to the machines I've tried on. Still might not be enough. Between Unreal's poor mac optimisation and my poor Unreal optimisation, it might simply fail to load. Still, shoot me an email at nationalinsecuritiespresents@gmail.com if you'd like a link to my crude Mac build.