@fetterdave: Yeah, this sadly seems to be a limitation with Unreal Engine 4 and Apple's graphical framework called Metal, which is only compatible on very recent hardware (2013 onwards, hence the Obduction MacOS hardware requirements). I think they may be able to compile their graphical shaders using OpenGL, but Apple have seriously neglected their support for it which complicates things.
Current Mac hardware still only supports old versions of OpenGL and not very well, plus with some of the more advanced shader and graphical features built into the game, i'm not sure if it's technically feasible for them to build OpenGL-compatible shaders.
Furthermore, with the age of your iMac and the fact that the majority of graphics cards in Mac hardware are pretty underpowered, i'm not sure if it would run on your computer at an acceptable framerate, even with compatible shaders.
It sucks, but there's various technical elements at play here, most of which are outside the developers control :/
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