Cannot upgrade to PS5 version

I have a problem with the free enhanced upgrade for PS5.
I cannot find it in the store and everything shows that I have to buy it again.
I already own the PS4 disc version and I have it installed inside the PS5 but I also have the PSPlus version but it's not installed.
Could someone please help me?

last edited by Ksigri

Sadly, this didn't help because when I go to the PS5 version's hub it sends me to the store to buy it. Maybe the problem is that I also have the PS+ version of the game? But it's not downloaded and I have installed the game via the PS4 disc. I also can't load the PS4 files on PS5 because it needs the Adventurer's Gear DLC even though I already have bought it again for a second time! Please help me!