I'm using
http://www.freedownloadmanager.org/download.htm
With ID/pass to paysite, I enter the thumbs url and tell the debth/levels to extract to get the actual highres.
Some testing as different sites require different settings.
Been using it for about 18 months now.
Works to extract Vids from thumbspage too.
If you are trying this one I would be able to help you "figure it out".
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[URL=http://www.casimages.com][/URL]