I don't understand this.  Scan rules settings:

+*.wallpaperscraft.com/* +*.png +*.gif +*.jpg +*.jpeg +*.css +*.js
-ad.doubleclick.net/* -mime:application/foobar

Basically the default scan rules settings + it should grab anything from the
subdomains.  In this case it's images.wallpaperscraft.com.

I only want the UHD/3840x2160 pixel jpegs from the nature category.  So I use

wallpaperscraft.com/catalog/nature/3840x2160

As default.  The scan rules are set up to grab everything though.  Anyway. 
The first picture link directs to

<https://wallpaperscraft.com/download/forest_fog_trees_126479/3840x2160>

and the [Download Wallpaper 3860x2160] directs to the actual UHD-sized jpeg

images.wallpaperscraft.com/image/forest_fog_trees_126479_3840x2160.jpg

So the folder structure should be very clear.  But winhttrack never gets that
far.  I have a main folder with ~4 GB of html files and smaller 300 pixel
thumbnail jpegs.  I give up.  I rule in C#, C+, Java, Pearl and Rust, while my
knowledge about html, javascript etc is close to zero.  But when I look up the
html code the stuff seems pretty straight forward to me.

What am I doing wrong here?  What have I missed?