I found a workaround listed on the official site that involved copying the entire Livin' Large install CD to my hard drive, then deleting the .avi file for the promo, then installing from my hard drive. At the time of this writing, there is now a patch available for the installation problem. It is my opinion that this simply should not have happened. Electronic Arts is the biggest game publisher out there, and Maxis is an old, experienced hand at putting out games. And as everyone knows, the front staff is your all-important first impression.
Same thing applies with a game's installation.
I was as appalled as I was frustrated, and I feel compelled to give the expansion lower marks for this. Other than that, the expansion was rather a mixed bag for entertainment. I enjoyed the new careers and the added room for expansion in the new neighborhoods, but think they got a little too campy in places with the additional items without adding much utility. There are many new objects, and a number of them have unexpected side effects. However, while there are a few new interactions, none of them are particularly significant, and some of them are annoying.