Congratulations on your first post
And to your question: I don't know about the MAC version, but I doubt that you are able to do that with a PC version.
My question is WHY?
You can easily install TotSC after you have started a game in normal BG1. You do not have to make a new party and start all over. The new areas of TotSC will be visible to you (when times come), and you are able to visit these areas.
Remember to install the newest TotSC patch too.
Insane
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Ko-founder of the SCFC(TM) Korporation.
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