Wow, incredible amounts of bad information here :]
I ran a quick test:
$ flac -t *
flac 1.3.2
Copyright (C) 2000-2009 Josh Coalson, 2011-2016 Xiph.Org Foundation
flac comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
welcome to redistribute it under certain conditions. Type `flac' for details.
Track 01.flac: ERROR, MD5 signature mismatch
Track 02.flac: ERROR, MD5 signature mismatch
Track 03.flac: ERROR, MD5 signature mismatch
Track 04.flac: ERROR, MD5 signature mismatch
Track 05.flac: ERROR, MD5 signature mismatch
Track 06.flac: ERROR, MD5 signature mismatch
Track 07.flac: ERROR, MD5 signature mismatch
$ mediainfo Track\ 01.flac
General
Complete name : Track 01.flac
Format : FLAC
Format/Info : Free Lossless Audio Codec
File size : 5.98 MiB
Overall bit rate mode : Variable
Cover : Yes
Cover type : Cover (front)
Cover MIME : image/png
Audio
Format : FLAC
Format/Info : Free Lossless Audio Codec
Bit rate mode : Variable
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Bit depth : 16 bits
Compression mode : Lossless
Stream size : 4.08 MiB (68%)
Writing library : libFLAC 1.1.4 (UTC 2007-02-13)
So yes, there is something wrong with those files and they were encoded with an ancient version of FLAC (changelog here:
https://xiph.org/flac/changelog.html).