Similar problem here: Express keeps offering 'updates' - which turns out to be new Europe maps ('NT 2014.40').
But the maps are already on my nüvi (+SD-card) - and have been there since June, 30!
I believe I used another installation app(?) for the installation: Downloaded to computer first and then copied to GPS - the problem being that Express claimed there was insufficient storage space on the unit(s). I believe that old map versions are not automatically 'overwritten' on the memory card(?).
I suppose my current problem stems from the fact, that Express doesn't 'know' that the maps are in place(?) How can I correct that??