No.
Becouse BG2:SoA is 2 edition rules, so if ToB has 3 edition rules they must have made a whole new script. And that takes time.
And if Tob got 3 Edition rules the originale game can't work together with the ToB. Think the this: you start on BG2:SoA when you have installed ToB, SoA is a 2 edition game, but you have installed the 3 edition, what happens? The whole game would crash.
The Xlord
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