Sims 4 Packs not installing — “haywire”

@ryeewhiskee  For any pack with missing content, please delete the folder for that pack.  They'll all be in the game's program files, specifically in [install location]\The Sims 4; that install location might be Program Files\EA Games or Program Files (x86)\Origin Games, or a custom install location if you chose one.  The packs' folders are as follows:

Get to Work: EP01

Seasons: EP05

Realm of Magic: GP08

Werewolves: GP12

Spooky Stuff: SP04

I'm not sure about the guitar, but if you see an FP02 pack, that would be it.  (FP01 is the holiday celebration pack, F standing for free.)  Once you've deleted these folders, clear the cache for whichever app you want to use (again) and redownload the packs.

https://help.ea.com/en/help/faq/clear-cache-to-fix-problems-with-your-games/

If this doesn't work, create a new folder on your computer, on the root level of the drive you want to use (as in, it's not within another folder; its file path is just C:\Games or whatever name you choose).  Open your Origin game library, right-click on the Sims 4 icon, select Move Game, and choose the folder you created.  Once Origin has finished the process, repair again and then see whether your content shows up.