Downloading content from Sims 4 Gallery

Basically there are different categories you can download from the gallery, Households, Lots and Rooms. In order to do lots and rooms you must be in build mode, (note: entering a lot from the gallery will cause your current lot to completely disappear.) If you would like a household, you must be in CAS, you have the option to merge it with your current household or replace it completely. I hope I was able to assist you.