Uninstalled the game, reinstalled it recently, and now when I try to redownload the DLC I already paid for, it says cannot connect to store. Been trying for days. Love the support FF offers for their games. Good stuff.

Do you have the 'buy in app' option diabled? If you have you will get that message.

Try to enable the ability to buy in application, download it all and if you still are worried about it, apply the security setting again.