https://wccftech.com/demons-souls-lighting-mod-gets-2-0-update-unofficial-patch-out-too/

Demon's Souls, the FromSoftware PlayStation 3 exclusive, has been playable on PC for a while through the RPCS3 emulator (which just got a new update, by the way). In fact,

A rather industrious modding community has emerged ever since. When it comes to visuals, the Boletaria Reborn Graphics Pack is a mod that promises a complete lighting overhaul.