if you have troubles get them to email you the map, when they do download it on to desktop or easy to find place, then open bluefin application and connect the handset dont run the usual connection, but in the top left corner click the windows button and your given a few options: one restore original, the second one lets you upload a new map straight on to the device, click that and then choose the map you downloaded and it does the rest - erases the existing bluefin map replace with the new one, takes 10mins, then you just upload straight to car no need to return the car to stock mode.
hope this helps, mine was in my inbox 9am this morn.
by the way im rather impressed with new map, has so much more pull in all the gears
not overly happy with bluefin, some proper R&R in the first place and we wouldnt be having these issues....