Install your Trip & Waypoint Manager.
Download the latest nRoute from here .. down at the bottom is nroute_276.exe.
Index of /perry/nroute
That will isntall nRoute v2.76.
If you want the latest Mapsource, you can download it from Garmin's website.
Garmin: MapSource Updates & Downloads
You will need the Trip & Waypoint Manager installed before installing the other two because they are "updates" and will look for a previous installation of something Garmin. Trip & Waypoint Manager will satisfy that check. Once they are installed and working, you can uninstall Trip & Waypoint Manager.
If you have issues with the latest version of Mapsource from the download above, you can install an older version. I would recommend 6.13.7.
Let us know how it goes.
...ken...