I downloaded the NA 2007.2 image via Bittorrent, and successfully burned a DVD on my imac by just using the standard Disk Utility. Nothing additional was needed. It wouldn't mount on the desktop after I burned it, so just to play it safe I burned another from Windows XP using ImgBurn. That one would mount within XP, but still wasn't seen by MacOS. I compared the DVDs and they are identical.

They still wouldn't work with my Z4 which is running 29.1. I had the same issue as everyone else in that the DVD wasn't recognized. I took a closer look at the 2007.2 I downloaded versus the 2006.1 that came with my car and the file structures are completely different. I'm guessing the version of 2007.2 we are finding via BT are for the "Professional Nav" while our MKIV systems want the "High Nav"

RCNet