Many a time we may get an error message while installing the device software on a mac or window software. There could be many reasons for having such issues. It can be due to corrupt installation of the file. It can be due to inaccurate permission settings also. It is recommended to all the users to eject and reconnect the Garmin GPS maps device from your Mac or PC and connect it properly by using a USB cable provided with the device by your seller. To get more details visit our website at http://garmingpsinstall.com/ or contact us 18008363164 toll-free.