I have installed the game on my Macbook Pro, it starts, I see the loading screen but then the screen freezes black, I can barely see the profile selection screen.
It's a MBP mid 2010, is it too old and incompatible?
This is unfortunately a known issue with the shadows rendering!
To "fix" that you have to disable shadows before launching the game.
Travel to your Documents folder and check
Larian Studios/Divinity Original Sin/graphicSettings.lsx
There you can change different parameters including Shadows, which you should set to zero.
On a more interesting note, I see you're living in Belgium. How do you think - can you visit Larian Studios in Ghent? We're not talking about day/time - just the notion, how do you think can you help a bit with this?
As for the reason of your issue I am afraid this might be driver bug.