Game and expansion packs downloaded but not being recognized by the game itself.

A few weeks ago, my sister came to me for help figuring out why a few of our packs suddenly stopped working. The ones I have noticed so far are "Get to Work," "Island Living," "Discover University," and "Cottage Living," but I suspect there are more. In game, when I go to "Manage Worlds," The worlds from these packs have a white tint to them and are unavailable. I have tried everything from restarting my PC to deleting the entire game and reinstalling everything (which took three hours). The exact error message is "World not installed. Once this pack has finished downloading restart The Sims Four to install it," and obviously that has not worked for the past couple of weeks. I've even disabled my mods and that didn't work either, so I'm genuinely confused now. The CAS and Build mode items associated with these packs are also unavailable, and the jobs that go with "Get to Work" do not show up to the career options. Any ideas? Cause I definitely don't have any.