Mac App Store version vs GOG.com version

[schuffd]

Is there a "real" Support for the games or still the forums where normal people talk to each other but nobody can help with real problems?

What about the ATI R9 in the Macbook 15" from late 2015 will it run?

And why are the versions so different, Mac App Store still version 1.0 ? So no updates for this game? On Steam or GoG you can find newer versions.