A PhantomJS script that gets a download url for the Windows 10 ISO from Microsoft.com

getdownloadurl.js

var system = require('system');

var edition = system.args[1] || 'windows10';
var language = system.args[2] || 'english';
var architecture = system.args[3] || '64';

var page = require('webpage').create();

/* Global helper functions */

function debug(/*msg...*/) {
  if (system.env.DEBUG) {
    console.log.apply(console, arguments);
  }
}

function assert(condition, message) {
  if (!condition) {
    console.error('Assertion failed:',message);
    page.render('error.png');
    phantom.exit(1);
  }
}

function waitFor(conditionFn, cb) {
  var countDown = 4 * 10;
  var interval = setInterval(function() {
    assert(countDown > 0, 'Timeout while waiting for DOM elements on page');
    countDown--;
    if (conditionFn()) {
      clearInterval(interval);
      cb();
    }
  }, 250);
};

/* Page specific helper functions */

page.waitForElement = function(selector, cb) {
  var page = this;
  debug('Waiting for', selector);
  waitFor(function() {
    return page.hasElement(selector);
  }, cb);
};

page.click = function(selector) {
  debug('Click', selector);
  this.evaluate(function(selector) {
    $(selector).click();
  }, selector);
};

page.hasElement = function(selector) {
  return this.evaluate(function(selector) {
    return !!$(selector)[0];
  }, selector);
};

page.selectItem = function(selectElementSelector, optionText) {
  optionText = optionText.toLowerCase();
  var optionTexts = this.evaluate(function(selectElementSelector) {
    return $(selectElementSelector).find('option').map(function() { return $(this).text().toLowerCase().replace(/\W/g, ''); }).toArray();
  }, selectElementSelector);
  var optionIndex = optionTexts.indexOf(optionText);
  assert(optionIndex >= 0, '<select> element '+selectElementSelector+' does not contain <option> with text \'' + optionText + '\'. Possible options are:' + optionTexts.join('\n'));
  debug('Selecting <option> with text',optionText,'and index',optionIndex,'on <select> element',selectElementSelector);
  this.evaluate(function(selectElementSelector, optionIndex) {
    $(selectElementSelector)[0].selectedIndex = optionIndex;
  }, selectElementSelector, optionIndex);
};

page.selectEdition = function(productEdition) {
  this.selectItem('#product-edition', productEdition);
  this.click("#submit-product-edition");
};

page.selectLanguage = function(language) {
  var value = this.selectItem('#product-languages', language);
  this.click('#submit-sku');
};

page.open('https://www.microsoft.com/en-us/software-download/windows10ISO', function(status) {
  page.waitForElement('#submit-product-edition', function() {
    page.selectEdition(edition);
    page.waitForElement('#submit-sku', function() {
      page.selectLanguage(language);

      page.waitForElement('.product-download-type', function() {
        // The download buttons do not have an unique ID. The `32-bit` and `64-bit` texts that are in the buttons have a className `product-download-type`.
        // Search for that className and the parent should be the button we're after.
        var downloadUrl = page.evaluate(function(architecture) {
          return $('.product-download-type:contains('+architecture+')').parent().attr('href');
        }, architecture);
        console.log(downloadUrl);
        phantom.exit(0);
      });
    });
  });
});