Go to the Garmin Express website and log in. In your browser, go to https://www.garmin.com/en-US/software/express/. 1. For Windows, click Download. This will start the download of the Garmin Nuvi update file. 2. Install Garmin Nuvi updates on your computer. To do so, follow these steps: 3. Connect your Garmin Nuvi to your PC. 4. When prompted, select Add Device. 5. Finish the setup. 6. To install everything, click Install All. 7. Allow your Garmin Nuvi to finish installing updates before proceeding.