How to upgrade Ghost of Tsushima from PS4 to PS5

Why does the ghost of Tsushima ps5 upgrade cost $19.79 if I already own the ps4 directors cut version? : r/playstation

Thinking about upgrading from standard ps4 version to Directors Cut. Will I be able to play this on ps5? : r/ghostoftsushima

Ghost of Tsushima: Legends and New Game+ out October 16 – PlayStation.Blog

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Sony charging £9 for Ghost of Tsushima's PS5-exclusive features