High School Years unavailable on PS4

Hello @hey_its_dr584,

Try downloading High School Years using these steps:

1. Quit the game if you have it running.
2. Go to your Library.
3. Choose Purchased.
4. Select The Sims 4.
5. Scroll down to Playstation Store and open My Add ons.
6. Find High School Years in the list and start the download. 
7. When the download finishes, let your new content install and restart your game.

If this doesn't work for you, be sure to let me know!