Following the tips, I got the game to install. But it didn't run. Under Crossover Mac, I had nothing. Under Crossover Games, I had an error about running it under a debugger.
After some work with google, I turned up a solution: it's doing some kind of anti-piracy stuff, http://www.codeweavers.com/support/wiki/dmca
Game now runs for me fine under Tiger/intel. Some graphical flicker, mainly when pushing back the fog of war, and some audio stutter in scripted scenes, but otherwise no problems (so far 😊 ).