Go to https://www.mixamo.com/store/#/search?page=1, make sure you're logged in.
open up chrome console by pressing F12 on your keyboard on the Mixamo webpage. Click on the "Console" tab in the new window (developer console).
Paste in "DownloadMixamoByLouisHong.js" into the console input and return. It'll starting downloading from that page and until the last page.
Change Fetchlist to (They Changed it again)
function fetchList() {
console.log("Fetch all the animation in this page, you can optimized this by setting to page to 96 per page on the upper right")
return $("div.product-list.thumbnails-sm")[0].childNodes;
}