Ok. After running the instail process. It says UnionCove.Sims3Pack.failed.
Since this is the first time I saw that this can happen, I googled it and find 2 more reports on web, but no explanation at all
Only thing I can think of is that you may not have enough free space, or that file is damaged somehow. I'm really sorry that happen, and as I said, never saw it before. Hope someone else might know more about it.