Just checking, you know you can get this from gog.com don't you?
You know you could have at least clicked on the link I posted. I not only own Alpha Centauri, I own two copies of it. One for the PC and one for the MacOS. I own the expansion. I used to play the unofficial OS X native port. But it was a struggle and it was always based on Carbon ie old codebase and now does not run at all on Mac OS X Lion or whatever the marketing people are calling the current version of Mac OS X.
I linked to the Good Old Games page in my blog post. I could use my mom's old, old, Windows 98 computer to try and play it, it's in a box somewhere, or as I hypothesized, I could run it on my old G4 Tower, which can't run Mac OS X Lion due to more decisions by Apple to not support old hardware. I could even try running it on my current MacBook Pro as I have Windows 7 installed on that, but most of my stuff is in storage, including my discs for Alpha Centauri.
So yeah the game is available for purchase. But it is unplayable on the current version of Mac OS X. Thus requiring you to run an old version of your OS to play a game, which will run buggy as it was ported to Mac OS X by one of the programmers who also liked the game in his spare time. Or I could find an old Windows PC in storage and try running it on Windows 98 or I could try running it in emulation. None of those solutions are inspiring. Running the PC version on my laptop might be the most viable if I can find my PC copy of Alpha Centauri, but I only have the expansion for Mac... What I and others want is Alpha Centauri 2.0
I've long maintained it is the best of the Civ games with the most varied gameplay. It also had the most interactive planet. You could even terraform and build land bridges so you could march your troops across or you could just make all your troops fly.
Apparently EA has the license and is not interested in making a sequel even though people are still buying and playing the original.
Plus if you think Nukes are cool, you should try the Planet Buster...
Cheers,