The following platforms offer the 4K Ultra HD version for purchase or rent as of :
track (24-bit). There is no official "Dolby Atmos" version of the movie itself. Dolby Atmos Soundtrack : While the movie doesn't have Atmos, the Interstellar Original Motion Picture Soundtrack by Hans Zimmer was recently updated and released in Dolby Atmos on platforms like Apple Music Atmospheric Up-mixing
audio track does not exist for the film itself. Director Christopher Nolan famously prefers DTS-HD Master Audio 5.1
The only way to get a legally is via Digital Copies included with the physical disc or through "Download to Own" services that offer high-bitrate MKV/MP4 files.
You can legally acquire a 4K digital version (typically with HDR10 or Dolby Vision) through the following platforms:
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