[ajg1977]

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/P...

[lightedman]

Not across all platforms, it does not exist. So my PlayStation Steam stuff takes a serious chunk of bandwidth.