This should help, taken from
https://support.garmin.com/en-US/?faq=W ... qSearch%2F, and applies to the zumo 450/550/665, others can use Express to directly install the map without needing to use MapInstall.
Step 1: Install the map to your computer
If an updated region has not been installed to the device
1.Open Garmin Express
2.Select the device to update
3.Click on View Details
4.Click on Installation Options
5.Select Computer and Device
6.Click on Install or Install All
7.Accept the license agreement
8.Click Continue
9.Select a region to install to the device, then click Continue
If an updated region is already installed to the device
1.Open Garmin Express
2.Select the device to update
3.Click on Map Options
4.Click on Install to Computer
5.Accept the license agreement
6.Click Install Update
Step 2: Prevent the computer from sleeping
Before starting the map installation, ensure that the computer is not set to go to sleep while the installation is in progress.
Windows
1.Press the Windows key + R
2.Type powercfg.cpl
3.Click Change when the computer sleeps
4.Change Put the computer to sleep to Never
5.Click Save changes
Mac OS X
1.If using a MacBook, connect the computer to the power adapter
2.Click the Apple in the menu bar
3.Click System Preferences
4.Click Energy Saver
5.If using a Macbook, select the Power Adapter tab
6.Drag the Sleep slider to Never
Step 3: Install the remaining maps to your device using MapInstall
Windows
1.Insert an MicroSD/SD card into your Garmin device
2.Connect the Garmin device to your computer
3.Open MapInstall
4.Select the MicroSD/SD card in the Device drop-down box
5.Click Continue
6.Ensure the correct map is selected in the drop-down box at the bottom of the window
7.Select the map region(s) that you would like to install to the memory card◦Click a map segment to select it
◦Click and drag a box around an area to select multiple segments at one time
◦Use the right mouse button to deselect segments
8.Click Continue
9.Click Install
Mac OS X
1.Insert a MicroSD/SD card into your Garmin device
2.Connect the Garmin device to the computer
3.Open MapInstall (this is included in BaseCamp installation)
4.Select the MicroSD/SD card in the Device drop-down box
5.Click Continue
6.Ensure the correct map is selected in the drop-down box
7.Select the map region(s) that you would like to install to the memory card◦Click a map segment to select it
◦Click and drag a box around an area to select multiple segments at one time
◦Hold down the Command key while clicking to deselect segments
◦Choose Clear Selections from the Edit menu to deselect all segments
8.Click Continue
9.Click Install
10.Click Finish
After MapInstall has finished loading the maps, disconnect the device and the maps will be available for use. The computer sleep settings can now be returned to the desired value.
