Can't buy PS4 Minecraft?

Moin people, my little cousin would like to play Minecraft on PS4. I first downloaded the demo. Now I wanted to buy him the game through the PS store, but I always get the message Buy not possible you already own the game. I already deleted the demo, but I still get the message. Can someone help me with this?

It depends on which version: PS4 Edition, or the brand new Bedrock Edition?

If you want to have the Bedrock, you have to use the PSN account that you are using NOW to see whether you have ever played the PS4 edition and how long, or whether you have bought the digital version from the PS4 edition. If this is the case, the Bedrock edition will be offered to you free of charge as an update.

Otherwise, go to the Playstation Store with all other PSN accounts and go to Minecraft or Minecraft PS4 Edition. If with one of the accounts instead of buying / a price is probably just installing, then exactly this account has the game. So if you want your cousin to buy the game, you either have to remove an account from the PS4 in order to buy the game with YOUR account, or you log on to Playstationstore.com via mobile phone, tablet or a PC using a browser and buy the game.

If THAT doesn't help, only the technical support at Sony will help.