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This question's only answer suggested illegally downloading a book - I flagged it with other and this stipulation but it's been up for almost 24 hours. What else can I / should I do here?
Flagging the answer was fine, and the entire question should have been deleted, which it now has been.
If the link can be removed without affecting answer validity, just use your edit super-powers. You usually don't kill a spider on the wall with shotgun.
If the answer is useless without link, it's link-only answer and should be flagged as being so.