When looking at your TomTom from a PC there is a folder called "itn" on the TomTom with the route inside.
If you look from the TomTom you go to page 2 or 3 depending on your units, presuming its a rider it should be page 3, and there is a button for Itinerary Planning.
In there you will find a button under options and a "Load" button, you should now see the file you downloaded.