I FOUND A SOLUTION!
and I am so happy!!!!
I tried removing my mods folder and installing, and for whatever reason it worked.
Thanks,
Tornadobeard22
This one? http://awesims.sixty-ten.net/2012/04/30/st-claire-a-new-world-for-the-sims-3/
How big is the world file? The Launcher is so temperamental with big files and that looks relatively big. The game can only access up to 2Gb RAM, no matter how much you have installed in your Mac, and the Launcher uses 2Gb just to open so if it's then trying to install something big it's going to struggle.
You also have the added issue that your Mac's graphics card is not supported in the game which causes an abundance of additional problems.
You could try removing all installed content and installing that world first, followed by your other stuff bit by bit.
Yes, that is the world. It says it is 127 MB, but I have installed other worlds that are larger in the past. I have also tried installing things that are very small (like a pillow) and those did not work, as well as trying the method you just suggested. I've tried most methods and nothing seems to work- maybe I am rendered hopeless? @Bluebellflora
