"The code you entered has already been used..."

np 🙂

try your the sims 3 purchase history to see if the code successfully took and download from there then install it although hidden springs is a tricky one to redeem you redeem the code in your the sims 3 account in some cases the world is added to your sims 3 purchase history download and install from there in other cases the simpoints are added to you sim point balance BUT the points are to "buy" the world with also worlds  do not and will not show up in  the origin my games tab as they are sims 3 store items and you will still play from whatever game you normally play from the world once downloaded and installed will be in the main menu +new game to select the world to play in

if you redeemed the code in your origin account that can make the code invalid/used you may need to contact CS if that happened

1. Go to thesims3.com and log in with your account
2. Go to the general redeem a code page: http://www.thesims3.com/incentive/generalredeem.html
3. Enter the 16-letter code (this is not for 20-letter codes) and click on Submit
4. Go to your purchase history to download the world (make sure your game is updated to the newest version)

if in the event you need to contact CS

1.https://help.ea.com/en/contact-us/
2.Click on the orange NEXT button
3.Select a platform
4.Click on the orange NEXT button
5.Select a topic and describe your problem in a few words
6.Click on the orange NEXT button
7.Click Chat Now to chat with a Game Adviser