Wincigarette...
7. Do not flame - If the entire point of your post is to tell someone what an idiot they are, don't bother.
Ontopic: All macs can Right Click. You can to Ctrl + Click. OR you can put two fingers on your mouse and press down. (On a laptop with a Trackpad)
ON ON Topic: If you do My steps combined with Sandwich's it should work, Also, Try going into OFFLINE MODE, unless its Saying "Verifying game files..."