PDF.js Not available in Status Report even though it's in libraries directory

Are you using Linux? Have you check your file permission setting?
What's the pdf.js version?

Comparable problem with Windows 10, Wampserver64 (but also on the production site), Drupal 8.2.6, pdf.js 1.6.210. Browsers Internet Explorer 11 , Edge and Firefox.

In the file-field manage display the options ‘PDF: Continuous scroll’ and ‘PDF: Display the first page’ are working fine, great!
But choosing ‘PDF: Default viewer of pdf.js’ generates the message 'Please download and install pdf.js!' just after the label without showing the pdf-file.

What I did: First installed the Libraties module (8.x-3.x-dev), then unzipped the pdf.js in /libraries/pdf.js/ and as last installed the PDF module. Flushed all caches, restarted Wamp, gave the verified user all rights and disabled Windows blocking of the files pdf.js and pdf.worker.js, unchecked Combine JavaScript files in Drupal, but unfortunately no avail.

Maybe I'm doing something wrong or do I just have to be patient? Could you please give me advice? Thanks.

Upon checking the pdf.module the version argument pattern is not up-to-date and does not match the new library anymore.

Please see pdf.module file and check out pdf_libraries_info()

function pdf_libraries_info() {
  $libraries = array();

  $libraries['pdf.js'] = array(
    'name' => 'pdf.js',
    'vendor url' => 'http://mozilla.github.io/pdf.js/',
    'download url' => 'http://mozilla.github.io/pdf.js/getting_started/#download',
    'version arguments' => array(
      'file' => 'build/pdf.js',
      'pattern' => '/ersion\s=\s\'(.*)\'/',
      'lines' => 32,
    ),

Where the pattern should be:

'pattern' => '/ersion\s(.*)\s/',

The reason behind it, the pdf.js

$ head -n10 build/pdf.js

/* Copyright 2017 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at

There's no *ersions = 'X'* within the first 32 lines of the script. However there's *Versions 2.0* which pattern ersions\s(.*)\s can match.

In summary:

You may contact the author, or hack the module right away just to test (we don't recommend modifying the module as it may get overwritten during updates):

Open pdf.module and modify line 50 to -> 'pattern' => '/ersion\s(.*)\s/',

this comment is possibly reserved for just the latest Drupal 7 version; I have not tried to analyze or work with the Drupal 8 version of this module.
My apologies for posting incorrectly.

I tried the fix in #6 but it broke my site, giving me the white screen of death. Putting it back did not remedy. I could not get to any pages until I deleted the pdf module files and then I was able to get to and run update.php and get back to pre-pdf installation status.

#6 was the fix for me on Drupal 7.

I closed this issue since Library was not required for 8.x and 7.x has been fixed.