Dragon Valley on Steam
HanakoTheStealer Is one of these the website you're using?
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-editionYou should be able to make a purchase from one of those without going through the EA App (I tried just now and got to the payment details screen), and in fact it's more reliable this way. Once you've made the purchase, take your code and register it at store.thesims3.com, signed into your EA account, whichever one you've used to register your Steam copy of Sims 3. Then you can download it from your purchase history or its product page.
I have a Steam install as my main copy of Sims 3, and I use all my purchased worlds with it, including DV. So do many other players. It works fine as long as your Steam product code is registered to the EA account that also owns the world(s) in question.
