You might as well install it right away. It makes for a little smoother transition after you beat the first game.
Congratulations on the purchase by the way. I'm currently on the last battle of the expansion pack, and its been one of my favorite games I've ever played. If you haven't played Baldur's Gate I, I recommend finding a copy before you start part 2. Its a hell of a thing to build your character up from 1st level to the end of the series.
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