To be honest, I don't know how anyone on a Mac is running this (unless they also have the SDL framework elsewhere and it's getting pulled in).
The console (Applications -> Utilities -> Console for those who don't know its there) shows error Messages from apps and such. This is the error that's spit out when DOM2 tries to launch:
dyld: /Users/username/Downloads/dom2demo_osx Folder/dominions2demo.app/Contents/MacOS/dominions2 can't open library: @executable_path/../Frameworks/SDL.framework/Versions/A/SDL (No such file or directory, errno = 2)
Basically what that says is that the framework SDL should be inside the application bundle. Well, it's not. The demo that's distributed is missing that framework at least, and possibly others (can't tell since the app can't get past not having that framework). It looks like a copy phase was missed during build. I'm a Mac OS X developer, btw, so I'm not just blathering on

.
Seriously hope someone's reading this post 'cause I'd really love to play the demo but obviousy we Mac Users aren't likely to get anywhere if the SDL framework isn't available for DOM2 to get at.
[Edit]
Just after I posted this, I saw someone mentioning that stuffit was crashing. Perhaps the archive is corrupt and thus not everything is getting unpacked as it should be. So maybe the copy phase worked but the archiving didn't
[ October 29, 2003, 03:33: Message edited by: Cameroon ]