Any way to bulk download full images from a website and not their thumbnails?

I'm a bit new to this archiving thing so bear with me:
I'm trying to download all the images from a website, this one specifically: https://stevegallacci.com/archive/edf
However, when I use a tool like DownThemAll, it just pulls the thumbnails that link to the full image and not the image itself. Dunno if that's because I'm using the software wrong or that's just a limitation of DownThemAll. Is there any way to bulk download the full images without having to do so manually? Thanks in advance.