Interstellar Soundtrack Flac Link -

Interstellar original motion picture soundtrack by Hans Zimmer is officially available in high-resolution FLAC (24-bit/44.1 kHz)

Conclusion

1. List known legal stores that sell/interstellar soundtrack in lossless formats (I’ll search the web), or
2. Give step-by-step instructions to rip a purchased CD to FLAC, or
3. Show how to verify FLAC file quality and metadata.

: Both services offer lossless streaming. Apple Music now features a version with Dolby Atmos interstellar soundtrack flac link

If you don't want to buy, you can "rent" the FLAC. Tidal’s HiFi Plus tier streams the Interstellar soundtrack in Master Quality (MQA) or FLAC. However, you cannot download the raw FLAC file to keep forever. List known legal stores that sell/interstellar soundtrack in