Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Two original games not included in physical CE?

Hm... In that case I have also one question (as someone who has just one game on Steam):

When I get the physical disc of D:OS: Do I have to install the game from the disc and then activate/update it on Steam? Or can I just type in the activation code on Steam and download the whole game from Steam (without using the physical disc at all)? The reason why I am asking is because the DVD drive in my laptop had to make place for a second hard drive...