The download is pretty slow, considering that the total size of all the files is only 553 MB. And I had to download it twice, because during my first installation attempt I got a "There is a problem with the USB drive" error message halfway through. That was irksome, since it was a brand-new drive, but I took it inside, reformatted it on my PC (takes a long time to format an 8GB USB drive), redownloaded the update, then went back to the car. Fortunately, the installation process picked up where it had left off.
Naturally, I had to reload my MFT JPGs for the umpteenth time afterward.