In case anyone does want to carry on using Humble Bundle I've just updated my multi file downloader Chrome extension to work with the new website. New release on Github here:
https://github.com/andrewmk/humble-b...oader/releases
Let me know if something doesn't work.
You have to log in, go to your library then the bundles tab and pick a bundle. Then you should be able to 'scan for files' in the extension.