Problem with installing game MAC

[mrbebe9586]

I have a Mac OSX 10.8.5. Previously I bought the Sims 3 nightlife and high end loft stuff pack which included the sims 3 original. When I try to install the sims 3 supernatural I am told to chose a location where the sims 3 is installed. However, the location I am choosing (Macintosh HD) is where the first pack was installed. What can I do? I have moved around the sims 3 app and selected certain files but the installation still does not work. I have no internet connection on the laptop.

[caspinwall]

The Sims 3 will have files in two locations on your hard drive - you want to install the expansion in the "The Sims 3" folder in Applications, not the similarly named folder in Documents.