After creating and naming a route, click on "Transfer Route to Vehicle" and do the following:
1. On the page that comes up next, click on "Saving the route to USB memory stick" on the bottom right of that page.
2. On the next page that comes up, click on "
Route herunterladen" (in the middle of the page). That will send the route to your computer's desktop. You will see a zip file with your route's name.
3. Move the file to your USB (right click on the file and use "Move to" to send it to the USB).
4. Once on the USB, extract the file there (right click on the file and click on "Extract Here").
You should now have a folder on your USB named "BMW Data". That folder will have in it a folder named "Nav" and in that folder will be the routes file with the extensions .tar.gz. Don't do anything with all of that, just leave it all in the BMW Data folder. Put your USB in the car (glove box USB, not 6FL) and follow the directions on the website to download.
Hope this helps.