Sid Meier's Gettysburg - Downloads
User Created battles and scenarios
Game design tools
Download the version 3 patch for SMG as a plain .zip file rather than as a self extracting file which may be problematic on XP, Vista or Windows 7.
Installation for Win ME/98/95
If autorun of the CD gives a Kernel32.dll error then run setup from the CD.
Installation for Win XP or later
Also see here, here and here for Vista and Windows 7.
Playing on machines without a CD drive" & "Final Observations" here.
If the game crashes with an error message on the Preferences screen, make sure you have the new version of LABELS.TXT that comes with Patch 3 in the Gettysburg folder.
If videos do not play see section 3 here.
If the game runs too fast see section 4 here.
See also Sid Meier's Antietam Downloads
& Featured downloads at the Gettysburg Online Society