Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Interested in buying the game -

I want to buy the dvd-rom version of the game. I don't usually play games on my mac, so I had a question about the installation. If I buy the disc do I have to use the disc every time I want to play the game? Or do I just install the game from the disc and then I can play it whenever I want?