At a glance
Divinity: Original Sin 2 - Definitive Edition has a Mac version: Steam sells it for macOS. Install it in Steam for Mac; it doesn’t need Uncork.
Divinity: Original Sin 2 - Definitive Edition came out on Steam on 14 September 2017, made by Larian Studios.
What your Mac needs
Minimum macOS in the Steam requirements: 10.13.6.
Steam requirements list at least 8 GB of memory for Divinity: Original Sin 2 - Definitive Edition.
Allow about 20 GB of disk space for the Mac version.
How to play
Open Steam for Mac and install Divinity: Original Sin 2 - Definitive Edition as usual.
If the Mac version will not start, you can install the Windows version through Uncork: download Uncork, sign in to Steam and install Divinity: Original Sin 2 - Definitive Edition from there (60 GB). We have not tested it ourselves.
The Windows version through Uncork needs a Mac with Apple Silicon (M1 or newer).
Divinity: Original Sin 2 - Definitive Edition uses DirectX 11: Uncork renders it with D3DMetal.