In my post of 22 Feb 17 - 12:21 PM I gave the MD5 checksum for the big zipfile. If you have this checksum, from someone who has an accurate copy, you can check if the file you download is faulty or incomplete.

It turns out that there is a built-in way of checking checksums in Windows, but it's well hidden. So in case it's useful in future I'll note it here.

Open a command prompt: it's in the Start menu in Win 7, or in Win 10 type 'command' in the search box to find it.

The command is

certutil -hashfile complete-path-to-file MD5

To find the file path right-click the file in the file manager and select Properties. If the filename includes spaces put it in quotes. Don't forget to include the file extension - eg .zip - which the file manager probably hides.

So for this zipfile I type:

certutil -hashfile "c:\users\david\Documents\temp\The Columbia World Library Of Folk & Primitive Music.zip" MD5
  MD5 hash of file c:\users\david\Documents\temp\The Columbia World Library Of Folk & Primitive Music.zip:
  ae ba 9b f9 b4 1e e6 6b 48 6c 7c 31 98 97 4c b6
  CertUtil: -hashfile command completed successfully.

Replace MD5 with SHA1 or whatever if a different hash algorithm is used.

Linux users will know the command MD5SUM to calculate checksums:

david@pan:~/temp/temp1> md5sum "The Columbia World Library Of Folk & Primitive Music.zip"
  aeba9bf9b41ee66b486c7c3198974cb6  The Columbia World Library Of Folk & Primitive Music.zip

I don't have a Mac.