Sims 3 Ambitions

I've recently lost all Sims expansion packs and stuff packs on my Macbook. I'm in the process of redownloading all of them again and the only that isn't working is Ambitions it get's caught on one of the files at the end of the downloading process, I've cleaned the disks and restarted multiple times but nothing is working. How can I fix this and successfully redownload the game?