Firmware 7.60 will not install

Using Garmin Express I have been trying to update my firmware from 7.10 to 7.60. Garmin Express will not, and says that the memory on my watch is saturated and it cannot perform the update. I deleted all activities and I do not have applications loaded other than those that came with the watch. The only maps I have loaded are those that came with the watch. I turned off the watch and started it again but same message from Garmin Express. Any idea of what can cause this issue ?