Download All Yammer Files

downloadAllYammerFiles.js

function getDownloadLink(el, i) {
    'use strict';
    var rlastForwardSlash = /.+\//,
        fileId = (el.href) ? el.href.replace(rlastForwardSlash, '') : '', 
        downloadPath = 'https://www.yammer.com/api/v1/uploaded_files/' + fileId + '/download'
    ;
    return downloadPath;
}
function downloadFile(dataUrl) {
    'use strict';
    // Construct the a element
    var link = document.createElement('a');
    link.download = 'filename';
    link.target = '_blank';
    // Construct the uri
    link.href = dataUrl;
    document.body.appendChild(link);
    link.click();
    // Cleanup the DOM
    document.body.removeChild(link);
}
var fileNodes = Array.from(document.querySelectorAll('.page-content .yj-tabular-data-name'));
fileNodes.map(getDownloadLink).forEach(downloadFile);

You can download the .min from https://gist.github.com/PCfromDCSnippets/d2c58f7372cbb119dd2e25b80b863191