Can't Download Sub-Zero PS4 fix: Go to the actual store, not the store within the game itself. Search Injustice 2 and go to the Add-ons. There should be a Sub l-Zero add
Injustice 2 [ Legendary Edition ] (PS4) NEW | eBay
Injustice 2 and Injustice 2 Mobile: Link your accounts and earn rewards – DC Games