I had one also and could not get any updates either. After an investigation, I determined that Rand McNally was not offering updates to this model of GPS anymore. Why? I do not know but it is what it is. So, they Rand McNally has lost a customer in me.
I went and purchased a Garmin RV 785 GPS with live traffic updates. This unit is light years ahead of the Rand McNally unit. The RV 785 & Traffic has a built in dash cam that will record and store videos via a memory card. You can also pair a rear view camera if you so desired to add the component. The unit will work with voice commands and can be paired with your phone via blue tooth for hands free calling.
Here is a link to the Garmin site.
https://buy.garmin.com/en-US/US/p/660552