Need help with Sid Meiers "Gettysburg" and "Antietam" games

[RIBob 39]

I can get the games to run on my Win 7x64 system, bit no sound.  I also cannot get the official upgrade to "Antietam" called "South Mountain" to play, as the battle pack (upgrade) keeps asking for the game disk.  Now that's odd, because the "Antietam" game on which it is installed plays fine with no disk whatsoever--although with no sound.

Can someone help me, or direct me to people or forums where such help might be available?  I'd be much obliged!

Edited January 1, 2019 by RIBob