You can purchase and download a high-quality MP3 version of "Sunburn" through several official digital retailers:
If you prefer streaming over owning a permanent MP3 file, "Sunburn" is available on: Ed Sheeran Sunburn MP3 Download
: Features official audio uploads and live performances. You can purchase and download a high-quality MP3
: Often carries digital downloads for his major releases, including standard and deluxe album versions. Streaming Platforms Ed Sheeran Sunburn MP3 Download
: Found on the + (Deluxe Edition) and various compilations.
: You can buy the song directly from the iTunes Store to keep an MP3/AAC file locally on your device.