Installing the game:
You can download the game from the PlayStation®Store .The basic operations are the same as those for a game on a disc. You can start the game after a portion of the game data has been downloaded. The remaining data will be downloaded in the background as you play the game.
Reinstalling the game:
If you are encountering issues with launching the game, delete the game and redownload from PS Store.
If the error persists, go to go to Settings > PSN and select Restore License
If you have previously activated the system as your Primary PS4, go to Settings > PSN > Activate as Your Primary PS4, deactivate, and then reactivate.