How do I download silent hill PS1 to my psp from Playstation store?

ok so 3 weeks ago i was searching for games and found silent hill but i dont have money so a bought a card and filled my account with money and serched for silenthill ps1 but didnt find it ?! i have been serching for a long time , what can i do to find it ? or where did dissapper ? please help

Right now they only have certain games out for the ps1 downloads in PSN and last time I check they didn’t had silent hill for the ps1 classics since bring out some ps1 games to download at a time.