I'm without a home Internet connection at the moment, and the launcher does not seem to let me play my game. When I launch the game with my disc inserted, my launcher pops up with a message that says "you are offline. Connect to the Internet to enrich your game online". However, there is no option to play offline anywhere on the launch screen. I have found ways to launch offline for PC, but so far nothing for Mac. Any suggestions?

I sometimes get that message within the Launcher, but it doesn't prevent me from starting up the game in the normal way. Does the Launcher look different in some way (apart from that message)? If not, just hit the play button on the left hand side as usual and it should start.

Yes it does look different. There is no play button.

Oh dear! Never had that happen. Could you take a screenshot and post it here so we can take a look?