Hey all. If anyone is experiencing the endless loop where a game will get stuck "Installing Application," with a digital upgrade game, remember that you need your PS3 disc inserted in your PS4 in order for the game to run and install. This applies to:
Assasin's Creed IV: Black Flag Battlefield 4 Call of Duty: Ghosts
If you do not have your PS3 disc you will be unable to play the PS4 digital version of these games as part of the upgrade program.