Cottage LIving Bonus Content Deleted

In my case I download cottage living pack and it said that it's installed but it doesn't show up on the game. what should I do?

I also had a few times the "items were deleted because you don’t have the relevant packs", but I never realised what was missing. I just ordered the High School Years expansion, and I was missing the bonus DLC (problem now solved), and it made me want to check about the bonus content for cottage living (which I knew I had initially). I couldn't find it, but, after deleting my mods and repairing the game, I realised that in game the bonus content from cottage living was not with the rest of the pack, but with base game objects (I can't remember if it was the case initially, but for High School Years, the bonus content is with the rest of the content of the pack, not with base game objects). It might be good for you to check if bonus items are within base game objects?