1. Open YouTube in a web browser or on the YouTube app.
2. Search for "Savage Garden Truly Madly Deeply."
3. Click on the music video under the search result.
4. Look for a small arrow pointing down under the video.
5. Click on the arrow and choose "Download video."
6. Select the video quality you prefer (e.g., high definition or standard definition).
7. The music video will start downloading and save onto your device.
Remember, downloading content without permission from the copyright holder is generally not legal. It is recommended to purchase or stream music using legitimate sources and services to support the artists.