I purchased The Sims 3 Worlds Bundle, and it DOES say that I own it. But I can't install it. I bought it on the EA app basically JUST before I added my first response to this thread. I currently am unable to check when that way. Eventually I just gave up and just bought a bunch of those Sim points and then bought Hidden Springs, Aurora Skies and Sunlitt Tides in the game itself when you go to make a new game and have to choose a world... I can't even get a refund for this... it's also sad because if this just doesn't work, that means I can't buy other add-ons for Sims 3, which I really wanted to do...
@Mauzawa You should have received an email with product codes for the worlds, which you could then register on the Sims 3 Store site and download from there. If you never received that email, or the codes read as used, contact EA customer support and get a refund. Please see the first post for more details.
You could try purchasing the worlds bundle again after getting a refund if you want. I realize that would mean buying a second copy of Hidden Springs, and SimPoints purchase cannot be refunded. But standalone Monte Vista is the same price as the bundle, and you could give away the HS code and probably make some other player very happy. Or you could skip MV; it's not exactly the most popular world, and you have plenty of others to play with right now.
