Only Monte Vista is under my history. Still says code use.
on thesims3.com under "My Page" does only Monte Vista just show up under the worlds you own or is Hidden Springs showing as owned too?
My worlds bundle pack had me install Hidden Springs 1st and then Monte Vista and they both had a different activation code, So make sure you are not using the Monte Vista Code
(Edit - Update: One of my other problems was my game/launcher was not up to date- if you use origin/windows/pc it should be Version 1.69) - but I was getting script errors and other things along with the code already used problem)
if you after you have tried:
1. Logging out of your launcher, game, and the sims3 website and closing out all of them
2. Delete the IE browsing history (even if you do not use IE - the game does and there is always stuff to delete)
3. Open up your launcher and log back in then check under the downloads to see if it showed up (Hidden Springs shows up under Lots - Monte Vista under Objects)
If it still is not on your launcher in your downloads then
4. Log back into your sims3 online account and check your My page again and the Purchase history to see if it showed up to download to your launcher
if that does not work
You might have to contact EA customer support either using the live chat or call them on the phone (the phone option will usually give you the option to have them call you back so you do not have to wait on hold for the next available person - as long as its during their business/call in hours) :
https://help.ea.com/en/contact-us/
I do not work for EA, but I was hoping since I had the exact same problem that what fixed mine would work for you too
Let me know if any of that works or what you find out or If you still have problems
