Ps3 not updating games
If you bought a boxed copy of the game you will need that copy to play it on PS4.
This works by after buying the game on the Playstation Store for .99, you insert the PS3 disc into your PS4 then start the game up.
Click more options and select export save -- It'll prompt you to sign in, do that, you might get an error that says the diablo servers are busy, mine worked on the 2nd try. Upon quitting out of the game IN GAME a second time to see if the hang was reproducable, the game hung again.
I have also checked with my ISP and they have advised that there are currently no network issues affecting the internet connection or speed within our region.