If your TV supports it, you don't need to download it; it’s already there. You can launch it using these methods: What are the Samsung TV Models that support Ambient Mode?

Because it relies on specific display technology—like the Samsung QLED No Burn-in Guarantee that allows static images to stay on screen for hours—it is not available as a standalone app in the Samsung App Store for older or non-compatible TVs. How to Access Ambient Mode (If Your TV Has It)

No, you cannot Ambient Mode onto a Samsung TV if it did not come with it pre-installed . Ambient Mode is a hardware-integrated feature specifically designed for certain models like the QLED , Neo QLED , OLED , and The Serif .