texansky thanks for the Reddit post and your suggestion! I've never downloaded s3pe, so I'll probably end up bumbling around with it before I can figure out what I'm doing.
I should note that I downloaded the house on a different computer from the one I now use; that computer died about a year ago, but when I got a new one, they gave me the memory card from the old one as well as copying all the info from it onto the new computer. I don't know whether this would affect my being able to possibly find the original download. The only thing I'm sure of is that I downloaded the house sometime in 2023, and I've downloaded quite a few houses, so it'll take a good bit of detective work if I'm able to get files from that far back.
Would it help at all if I posted photos from the other sides of the house and the interior?