Why can't you download the game series "Uncharted"

System: PlayStation 3

Hello my friends, I'm a fan of the Uncharted series and because the old Uncharted games are only available on Playstation 4 as a set and I only play on PC, I wanted to download the Uncharted ROMS here. The games are also displayed here on PS4, but you can't download them. That's why I wanted to ask if you can do that soon or if I have to download the ROMS somewhere else and if so, where? Thank you for the help. Best regards, Jakob