Fifty Shades Of Grey Movie English Audio Track - Download Updated

Yes. Search for "Fifty Shades of Grey 2015 English AC3 5.1 640kbps" on audio-dedicated forums.

Purchase the 4K Blu-Ray (or digital UHD copy) for less than $15. Use MakeMKV to extract the DTS-HD Master Audio 7.1 track. This gives you a "forever updated" file that is future-proof for 8K TVs.

You downloaded a "re-encoded" copy. Find a "FLAC" or "Passthrough" version.