is it possible to extract the original high res photo without watermark from pixieset?

link:
https://corrinalouisephotography.pixieset.com/destinationmaximxnikkirokita/f/24075767/

I am trying to download these images, full res, without watermark

I went into the page source and saw that I could extract the img url, and adjust the url by adding "xxlarge" instead of "large" for a larger file. but the source code seems to me that the images are uploaded by photographer to pixieset, in high res, then the "proof only" text is added by pixieset on top of the image, but it is not the original image.

is it possible to extract the original image through the source code or some other way?
original image as the original high def without watermark image that was uploaded by photographer??

thanks!