Garmin Express repeatedly stalled beetween 0 and 14% progress after install new map begins.
Newest version of GE is loaded, 16GB SD card (with 12GB available), wired connection, restarted cpu after GE download, installed new map on laptop and viewed via Basecamp (no transfer capability to Nuvi750), attempted installs at different times of the day...
What finally worked for me was moving the existing files on the SD card to the Trash for temporary keeping (backup).
Then I started the install process once more with success, no stalls.
The download lasted a couple hours but the progress monitor continued to increment.
I didn't see this solution posted so added here. Hope it helps someone else.