Garmin Map Updates (Nuvi): Visit https://www.garmin.com/en-US/software/express/ Click ‘Download for Windows’ button to prompt the Garmin Express setup file. · Click ‘Download for Mac’ if using Apple device. Install Garmin Express: · Windows - Double-click on setup file, follow commands to "Install" page, give approval to "I have read and agreed to the terms and conditions", click Install, select ‘Yes’ · Mac - Open Garmin Express DMG file, verify software, click and drag Garmin Nuvi app in "Applications" folder and follow the commands to finish the process. Attach Garmin Nuvi to PC. Plug smaller end of Garmin Nuvi's charging cable into Garmin Nuvi unit. Also plug USB end into computer. · You need a USB 3.0 to Thunderbolt adapter for Mac. Open Garmin Express by clicking twice. Select Get Started near the top of the Garmin Express window. Add a Device by clicking " ＋ " in upper-left