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Which version ? The last official built is seven years old and, despite all the good I think about its author, it was already vastly outdated at that time.
Nowadays, that kind of software need an embedded JS interpreter to works correctly with the most dynamic websites. They mostly rely on AjAX and HTML 5 events, two things that HTTrack is totally unable to catch and interpret correctly. And, from the few I've seen, it's the case for h-flash.