It's a good (though not perfect) program for ripping images from a web page (including full images that are linked to through thumbnails), and it can also grab from forums sites with multiple pages. The author gave me a free key in exchange for a review 15 years or so ago, and I can still use it to activate the latest version.
There is a gimped free version which is sufficient for people with modest needs (under 100 images from a site) and if you don't mind nags and annoyances.
can't you just use jdownloader?