When I try to install Sims3Packs with the Launcher (I'm on a Mac), sometimes Installer just decides not to open. It might bounce on the dock for a second (mocking me), but then disappears. I know something is happening because, though launcher doesn't appear to be "frozen", I cannot press any buttons. I could install things fine before I purchased World Adventures. I decided to start fresh and reinstall Sims3 then WA. I do not think the issue is with the files, because I got a few to install by stubbornly repeating the action (quit launcher - open file - nothing - quit launcher - open file - nothing - quit launcher - open file - installer opens - yay!).
I did a few searches and didn't see anything on this subject. I know there are a few Mac users on here that I hope can help. I do not have access to a windows machine so I have been relying on the kindness of strangers.
I haven't even played the game since my reinstall, so If I have to chuck it all and start from scratch I can.