Thanks. Here in the UK, the Ford website Sync 3 update process requires registration and entering your car's VIN. There doesn't seem to be a way to select what you download - the system tells you what it thinks you need. In my case, it thinks I need a useless file that won't work, so I've hit a wall - no way to download maps until I get the Sync 3 software sorted (as far as I can tell).
Of course, I could call Ford's technical help line (and bankrupt myself in ten minutes, as it's not free of charge). OTOH, my car still has six months of the three year Ford warranty on it, though I've never bought a car that new before, so manufacturer warranties are a novelty! Do Ford cover software issues, or should I give up and go with Android Auto? TBH, I was pretty disappointed that the Sync 3 nav doesn't even have house number search (postcode only) - my 8 year old Garmin is better in that respect.
Never mind - the car is fine and the stereo sounds great. Oh, and that heated windscreen will be very useful when winter arrives.