You need to go back down to the mansion; there will be a door you can now open. The rope will be there.
Okay, thanks. Do I need to update the game? Because I've already tried everything and nothing happens. Can't you place a chest with a key that will open the door?
You get the key after defeating the boss on the second floor.
And how do I get to the boss? And how do I get to the second floor?
