Where is my Katy Perry collectors edition store content gone?

I don't know really, but the common advise seems to be to try to install the items again. If you have a ton of store content there is a guide to follow:
https://forums.thesims.com/en_US/discussion/866577/how-to-install-store-items/p1

If you have less, but still a lot; install worlds first, one by one, and then venues the same and then smaller items, not too many at a time.