See this thread https://forums.garmin.com/showthread.php?92502-Installed-Garmin-Express-now-can-t-load-latest-activities
The 405 is compatible with latest versions of Express and there is a link to this FAQ which may help http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={600f3dd0-3e6a-11dd-d7af-000000000000}&kbName=garmin