If you have recently purchased a Garmin device, the company will offer you free Garmin map updates for at least 90 days starting from the day of its first use. You can go to the “Map and “Map Updates” page of the company’s site, this will recommend you to install Garmin Express with which you can easily install Garmin maps. From my personal experience, I always suggest to use this program to update your Garmin device as it works on Windows as well as MacOS.
To update your Garmin maps, install Garmin Express on your computer and connect your device to it using a USB data cord. Garmin Express program will automatically find your device and give you a prompt asking to update your Garmin maps.