Start Heroes III Complete for Macintosh.

Choose New Game, Campaign, Restoration of Erathia, Spoils of War.

Does the game crash?

If so, you can send e-mail to: customer-support@... and explain
the problem. Maybe they'll put out a patch if enough people are
having the same problem.

Make sure you specify that it's the mac version too. Don't do this if
you've already e-mailed them about this problem before.

rogue