DisenLilja For Supernatural, please clear the EA App's cache:
https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/
You should then be able to download SN under Sims 3 > Manage > Manage add-ons.
For Dragon Valley, please see the first post of this master thread:
[Current Issue] Sims 3 Store world can't register/install | EA Forums - 11143823
You may need to get a refund and buy the content again, this time from the website.
https://www.ea.com/en/games/the-sims/the-sims-3/buy/addon/the-sims-3-dragon-valley
https://www.ea.com/en/games/the-sims/the-sims-3/buy/addon/the-sims-3-dragon-valley-gold-edition
Sims 3 content, including worlds, may go on sale again in a week or so for the holidays.