Think its for differant versions of the Nav drive although I upgraded mine to the 29.1 version with 3d etc...I just know that mine only works with HIGH. I have had Pro version in the past and just comes up with
“Unrecognised disk” but took a copy of my mates High 2006-1 DVD from his X5 and that works a treat. I realy want Speed Cams on it and only have the instructions for the 2008-1 disk.