..here's what I did
I downloaded the routes onto my computer. I then hooked up my GPS to the computer and opened up basecamp on the computer. When I did that, in the upper left hand corner of my screen is the option FILE. I clicked on that and got the option to IMPORT. When I did that it shows in my DOWNLOADS, all of the STAR routes. I clicked on each route individually, then clicked on the OPEN button in the lower right of the section showing the routes. WhenI did that, they appeared in Basecamp, one by one.
I then clicked on DEVICE....clicked on SEND TO DEVICE....and sent the routes I wanted to my GPS.
I'm sure there are a lot of technical terms I left out, but since I don't know what any of them mean, I can only tell you what I did using the words I know.