First, I need to consider that sharing copyrighted materials like books through torrent sites is illegal. The user might not be aware of the legal implications. Also, Proakis and Manolakis are the co-authors of the DSP book. The 4th edition is a widely used textbook in universities, so it's important to direct users to legal sources. I should mention that downloading pirated copies is against the law and could lead to legal consequences.