I just bought a Nuvi 2789 and am attempting to install updates to both the firmware and maps. I currently have FW 3.50 and am trying to install 5.30 (http://www8.garmin.com/support/download_details.jsp?id=6799), along with updating maps from North America 2015.10 to 2015.20. When I try using Garmin Express, the progress bar for the firmware fills up and restarts multiple times, then gives me a download error.
When I try using WebUpdater, the small download window flashes open and closed, and then tells me there was an error downloading the firmware.
I can't get the map update to start without the firmware first updating, although I was able to download the new map and BaseCamp to my PC by cancelling the firmware once it started. This still did not actually install the map to my Nuvi, though.
I am using an administrative account and have tried running both programs explicitly with admin rights, forcing the programs through windows firewall (win 7 64), and modifying the Garmin core service as noted in several other threads.
Any ideas?