I actually did find a solution - it is a big house and has several cc items, so maybe that was the issue. I saved each room of the first floor to My Library, and then deleted all the items in the room. Once all the first floor rooms were empty, I saved the house to My Library. Then I was able to download the house with the empty first floor, and then download each room individually. I was actually expecting to run into an issue on at least one room, and that would be the room with the cc that was causing the problem, but since they all downloaded fine, I'm thinking I just hit some kind of limit on the number of items or something. So, maybe it means that I got a little carried away with the house and its furnishings/decorations . . .
At any rate, I'll be able to start playing Ivy in her new extravagant home today after work.😀