The link above now gives you this..
"Sprint Navigation Download
Your Sprint handset is not supported at this time.
Please visit
Sprint Navigation on your PC for more information on Sprint Navigation supported phones and handsets.
You may be eligible to upgrade to a Sprint Navigation device through the Sprint New for You Upgrade Program. Go to
www.sprint.com/upgrades for more details"
I called Telenav a few minutes ago and they said my phone wasn't supported :(