Download all files in a Yammer.com group. You have to enable popups. Only tested in chrome.

yammer-group-download-all-images.js

/*
  
  # How to use:
  1. Navigate to the files tab (https://www.yammer.com/COMPANY/groups/GROUP/uploaded_files)
  2. Press F12.
  3. Paste script in console and run it.
  4. Enjoy downloading files!
  
  # Not working?
  1. Enable popups
  2. Try too use chrome
  
*/

// forEach method, could be shipped as part of an Object Literal/Module
var forEach = function (array, callback, scope) {
  for (var i = 0; i < array.length; i++) {
    callback.call(scope, i, array[i]); // passes back stuff we need
  }
};

// Usage:
// optionally change the scope as final parameter too, like ECMA5
var myNodeList =  document.querySelectorAll('.page-content .yj-thumbnail-item-link');
forEach(myNodeList, function (index, value) {
  var fileid = value.getAttribute("data-id");
  var downloadPath = "https://www.yammer.com/api/v1/uploaded_files/"+fileid+"/download";
  var popup = window.open(downloadPath);
});