Hello, unfortunately the soundtrack for this specific game was never released as its own album, and the only existing version of the ost is a lossy rip on khinsider and they did a very good job, but unfortunately it is incomplete, has some buggy files and i don't think it's placebo if I say that some tracks don't sound how they should.
I've tried looking into the artist's portfolio and various social medias, I've even tried to contact him myself but to no avail. However, on his Soundcloud he keeps some professional reels, among which there are songs from this exact game.
https://soundcloud.com/bergeaud_composer/sets/game-reel Track 4 from this reel for example is the iconic Blackwater City stage. Other than these two incomplete options, there's no other way to obtain the official score, so I thought that it could be a perfect candidate for receiving the VGS treatment.