Download HumbleBundle book bundles easier. Puts 'curl' statements on the page for you to copy.

humble_bundle_file_downloader.js

/* 11/27/2017 - Tweaked for a page redesign.
 * 1/6/2018 - Handle videos in book bundle.
 */
var pattern = /(MOBI|EPUB|PDF( ?\(H.\))?|CBZ)$/i;
var pattern2 = /(Download)$/;
var nodes = document.getElementsByTagName('a');
var downloadCmd = '';
for (i in nodes) {
    var a = nodes[i];
    if (a && a.text && pattern.test(a.text.trim())) {
        var name = a.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.getAttribute("data-human-name");
        name = name.replace(/\s+/g, '_'); /* change spaces to underscores */
        name = name.replace(/'/g, ''); /* don't want single quotes */
        name = name.replace(/:/g, '_-'); /* change : to _- for looks */
        name = name.replace(/,/g, ''); /* don't need commas */
        name = name.replace(/&/g, 'and'); /* taking out the pesky & */
        name = name.replace(/!/g, ''); /* taking out the pesky ! */

        if (a.text.trim() == 'PDF (HQ)') {
            name += ".HQ.pdf";
        } else {
            name += "." + a.text.trim().toLowerCase();
        }
        downloadCmd += 'curl -o "' + name + '" "' + a.attributes['href'].value + "\"\n";
    } else if (a && a.text && pattern2.test(a.text.trim())) {
        /* videos in book bundle */
        var name = a.attributes['href'].value
        name = name.replace(/\.zip\?.*/, '.zip');        /* remove ?gamekey=... */
        name = name.replace(/.*\//g, '');                /* remove http ... / */
        downloadCmd += 'curl -o "' + name + '" "' + a.attributes['href'].value + "\"\n";
    }
}
downloadCmd += "\n";
var output = document.createElement("pre");
output.textContent = downloadCmd;
document.getElementById("papers-content").prepend(output);