Is it possible to upgrade or downgrade from the PS4 version to the PS5 version?

If you already own the PS4 digital version of this title, you can download the PS5 digital version at no additional cost.
Please make sure it's available for free when downloading the PS5 version.
If you purchased the PS4 physical version, you can obtain the PS5 digital version from the PS Store. However, if you purchased the PS4 physical version and want to download and play the PS5 digital version, you will need to insert the disc into the PS5 console each time. Please note that if you are using a 'PS5 Digital Edition' console, even if you have the PS4 physical version, you cannot obtain the PS5 digital version at no additional cost.