Hi Everyone, new forum member here but long time user of GPSFileDepot files. I'm having this same problem loading the GPSFileDepot NE USA Topo map to my Rino 650.
My info: BaseCamp Version 4.7.2, Windows 10 Pro.
My question: should I use the mapsource solution found in this thread even though the last couple of posts indicate the 4.7.2 Basecamp fixes the problem?
The reason I'm trying to use the Rino is that I lost my Montana 650 out of my motorcycle sidecase last weekend.

Yes, I'm curretly going through the grieving process but have reached the acceptance stage. I'm reviewing options for how to move forward but in the meantime, I pulled my Rino out as an interim gps solution.
Background: I've had this NE USA Topo map downloaded/installed for about 8 years, on a progression of pc's, and it displays in Basecamp without a gps connected. I had reviously installed it to my Montana 650 memory card, and to the Rino 650 memory card, but don't see the map now. Actually, I recall that I couldn't see it on the Montana recently. I may have updated the Montana before I noticed the issue. I did update the Rino upon pressing it into service this past weekend.
So, I pulled the memory card and tried to reinstall the map to the Rino 650 units memory using Basecamp. It takes about 15 minutes to install, returns a message that the map was installed successfully, but the topo and roads don't show even though I've enabled it on the unit. I do see hydrologic data but don't know what the source of that is. After not seeing the map on the unit, I deleted the file from the unit and reinstalled, but still don't see the map.
I went for an adventure motorcycle ride following some uploaded tracks, and between the tracks and my iphone I was able to navigate successfully. But this takes me back to the old days in the nineties when a gps would show you where you were on the screen but without the benefit of a basemap!
I'm open to any suggestions, thanks much.