5. find the file labeled GameOverlayRenderer.dll and delete it
All that file does is put the steam stuff on the game, deleting just that file won't harm the game.
Also whenever you reload steam it reinstalls that file so if you want to play more pirates either disconnect your steam account from the internet or just keep going back and deleting it whenever you play.
This is what worked for me. BTW, this is an awesome game, one of the best ever made in my opinion.