That's correct. When I did it on my Cactus via a forum I had to generate a code I needed to put when installing via usb. Keep in mind if you install all the maps it takes a long long time, if you install just the U.K. maps it's a lot quicker but can still take a good 10 minutes or a tad longer. The sellers notes will probably state but if not that you have to keep the engine running.
2016 DS4 Crossback 2.0 BlueHDi 180 EAT6
2014 Cactus Flair ETG5 1.2
2005 C4 VTR+ 1.6 manual petrol