As it says in the listing for that set of DVD's, you need the 09/29 firmware update before anything later than about 2009 can be installed. There is a way to check if it is already installed (can't remember how, but if/when
@Alfie picks up on this thread he'll answer!), but I found that when I put DVD1 in (before 09/29 had been installed) the screen just said "unable to install" rather than attempting to install. Pretty obvious that the maps had not been updated since the car was purchased new in 2008, despite having been serviced at the supplying main dealer for about the first 5-6 years!! As soon as I'd had 09/29 installed DVD1 started and loaded up immediately. Bloody annoyed that the main dealer had not installed the FoC update while servicing the car, as it cost me quite a lot, but supplying main dealer did not respond to my email (MB North wales).
It takes about 2 hours for the full map update to install, which can flatten your battery or cause Comand to shut down mid installation - not a major problem as it will re-start from where it left off next time you start the car. However, to avoid this I start the car, then connect a battery charger either direct to the battery (S204) or to the under bonnet emergency +ve and a suspension top mount bolt (SLK), switch the engine off but leave the key in Position 2 so Comand will not shut down. From memory DVD1 takes 1 1/2-1 3/4 hours, DVD2 a further 1/2-3/4 hour.