If I understood correctly you want to download images from web page one by one.
Now question
did you try using screenscraping?
do you want to use dynamic selector?
If you want to use dynamic selector you need to know what is differed, if that is data table, that means that you can incrementally increase number. So first you need to create counter. To use dynamic selector it goes like this:
click on image you want to download
click on edit selector
mark part of selector you want to replace
click right click and then Choose variable (or argument)