Take a look at the 2006 trackpack profile ini file, look in GP4/Tracks folder. There you will see a list of the tracks in the track order for that season. Open the csm and the globalvars file in the data folder of the 2006 mod and look for the trackpack entry. You might see a listing for the tracks.
Place your downloaded 2013 tracks into the tracks folder. Using the 2006 track ini profile as a base, edit it to show the 2013 tracks in the order you require, save as 2013 tracks.ini then if necessary, open the csm or globalvars file and edit it to reflect the changes to the tracks. Select the new 2013 track profile in CSM and you can load one or all tracks.
Afaik there is not yet available a 2013 trackpack so use this method to load the tracks or an alternative method is to use the gpx_track tab in gpx and load the tracks into a trackset and save.
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