There's some serious business going down between Konami and Hideo Kojima right now resulting in the cancellation of Silent Hills and putting the future of any collaboration in doubt.
It also means that the teaser title for Silent Hills - creepy demo P.T. - has been pulled from the PSN store. As arguably one of the last projects Kojima made which wasn't meddled with, it's an important artifact, particularly as the main game will now never be made. It's gone, but it you installed it before, it may still be haunting your system.
Here's what happened when Eurogamer's Ian Higton removed the game. He doesn't seem happy about it.
So if you still have the demo installed, you can totally get it back and it stands to reason that if you ever downloaded it, you should still be able to get it back. For those of you who didn't bother to get it in the first place, you only have yourself to blame.