If you have the physical edition then you need the disc version in order for it to actually work, if not then you have to wait like me for Sony to do something
Go into the PS5 store and search for The Show, the upgrade shows up on the last choice on the right when it displays all the products that match with what you’re searching. That’s how I downloaded mine.
Some people have the option to select whst version to download and some don't. I'm one of them, the only "proof" i have the ps5 download is on the playstation website itself under "downloads". So i really don't know how SDS is going to fix this if your not emailing them and showing proof you bought the game. Also hearing from others the game is not available to download till the 20th which is the official day but there's no countdown or option to even try to download the ps5 version.