That's how I did it. I don't think it ever does it over wi fi. It should work. Joe Mac said he got one from Ford did not know they did that may be worth a try. I had no issues before or after the upgrade. But it's a good idea to have the capability. You know how computers are.
I am having issues as well with Lariat. I have downloaded the files to the USB stick. When I put the stick in the USB it says the file is loaded and will be installed at next startup or something like that. I have tried it over the last couple days and it still does not update.