EA App says I don't own packs I've owned for years

Hi! I recently got a new PC and downloaded The Sims 3, but I only have access to about half of the expansion packs that I own. The EA App acts as if I never bought them. I have the discs with the codes that I redeemed before the game became purchasable online, but the app says that the codes aren't redeemable. I do not want to buy these packs again since I already own them. What can I do?

The packs I can't download are University Life, Seasons, Generations, Showtime, and World Adventures.