Can you please whitelist Love Nikki -Dress UP Queen app? I've never had issue with updates for this game before but recently I can't download their newest update without using Data or play the game without using Data which I dont have on my Samsung Tablet. This game is played by many and I know not the only one having this issue. PLEASE HELP!
Try disabling the Xfi Advanced Security feature and see;
It's a popular game (my daughter plays it) - it's possible the update server is just overwhelmed. Give it a couple of days then try again.