Finding a direct digital download "game link" for (PES 2018) from official primary stores is currently difficult because the game has been largely delisted in favor of the newer free-to-play eFootball series.
: Digital versions or codes are sometimes available at Clarkade for ~$9.99 or through used listings on Whatnot . pes-2018-game-link
If you already own the game, Konami previously released several free "Data Packs" (updates for player faces, kits, and licenses) that were available for download on all platforms, including Steam , PS4, and Buy Pro Evolution Soccer 2018 - PES 2018 PS4 Code Finding a direct digital download "game link" for