Is there any info on how to install the Truck Map? I have Europe TRUCK 885 4056 & I downloaded Navcore v8.398.1917 (are these the correct versions). I assume I need to install them somehow or do I just copy them to the SD card?

I am installing them on a 8gb SD card that currently has the North American maps on. Is it better to empty the SD card (I can't see that I need the North America maps & have them backed up)

Apologies if there is a tutorial somewhere but I haven't managed to find it