Unreal has had the ability for games to create patches (new exe and changed/additional content) for some time. Distribution and application is generally the ha

Unreal has had the ability for games to create patches (new exe and changed/additional content) for some time. Distribution and application is generally the harder part of diff patching though and I suspect most early-access games prefer not to worry about it (though 40GB seems a bit further along than early access!) https://docs.unrealengine.com/latest/INT/Engine/Deployment/Patching/ https://docs.unrealengine.com/latest/INT/Engine/Deployment/P...