We suggest to delete the app from the phone and redownload it from the store. Once it's reloaded, go through the purchase process again; it will tell you that you have already purchased and ask if you want to redownload. Make sure you are doing this over a wi-fi connection as the download is pretty large.

This Sims app has a maximum size of 460 MB. Please assure that you have sufficient free space on your device.