map update failed

synced my EE2 today and it said there was a map update to install,

Downloaded, and click on dialog to install the map, and it failed (with no reason why) - saw red banner in Garmin Express saying there was an error.

Disconnected and quit Garmin Express, then connected again and now it says I am all synced, but I know that isn't true. 

What can I do to force the map update?