Using GE 3.0.9.0 and using Win7 Home Premium SP1 with all updates current.
With my 3597 connected to computer and recognized by GE, clicking on "Extras" starts the loading icon, but when it stops, nothing is listed. Have been able to view the "Extras" 2 times.
FYI - Going to "Garmin Garage" works to access vehicle icons and voices, so downloading works from webpage