After download, I get a series of *.jpeg and *.sat files.
How do I get to see them on TomTom?
Answer: copy the content of the downloaded "Raster" Folder to the "Raster" Folder on your TomTom. If no Raster Folder exists; copy the Raster Folder to your TomTom. (I copied to SD card)
Then "Browse map" and zoom out until you see the World map.