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.
I really appreciate the script! However, I see that the script is adding the assets to my account, but isn't downloading them. Any idea why that might be happening? Below is a screenshot of the console while the script is running.