The download ticked upward: 90%. 95%.
If the Eye of a Blood-drunk Hunter does not appear in the Hunter's Dream after defeating the Vicar Amelia, your DLC .pkg file failed to validate. Ensure the DLC ID matches CUSA00900 and reinstall the DLC package.
It is vital to understand that Bloodborne is a closed-console exclusive. You cannot simply download a file and drop it into a folder like you would on a PC game.