As I understand it, the first step interrogates the car and puts the answer onto your usb stick.
Then back to the computer for that to decide the correct update to download.
As said above, once the update has started, do not interrupt it. There are many posts on here about failed updates, then requiring a new Blue&Me module.
If it was mine, and working, I'd leave it alone.
If you are having problems with a recent phone not downloading phone logs and contacts, this is because the latest Bluetooth version is not backwards compatible. I found this with a new phone and my 2015 Fabia.
Deep inside the phone software (I'm talking Android here, no knowledge of iOS) you can set Bluetooth to 1.3 back from the current 1.4, then you get the contacts and phone logs.
I've no idea how this affects any music or video connections as I don't use them.