If you have the PDF but no audio , the book is useless. When buying a digital license, ensure it includes the MP3s (usually accessible via a OTO Navi app or download link).
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You won’t find a high-quality, official because the series isn't designed for that level. If you see a site claiming to have one, it’s likely a mislabeled N4 book or a virus trap. If you have the PDF but no audio , the book is useless