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You can install it anytime and it will upgrade your current saved games. I would recommend doing that because ToSC doesn't change the story ending. It adds new four areas that cannot be completed prior to the final battle anyway (win final battle = game over). It also upgrades your games to include new spells, items and weapons, improved stacking, and lets you know which items required IDing. The game is much better with the expansion. One of the new areas, Durlag's Tower, is nearly a small game in itself.
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