I'm upgrading from the PS3 to PS4 versions of the game, and I redeem my code and the download begins. However, the download has failed ("The connection to the server has been terminated NW-31194-8"), and I cannot find a way to restart it, having followed the 'suggested actions' of turning off the PS4, resetting the router, and so on, but they haven't worked.

What else can I do?