If you need the to the publisher's sample or answer key, let me know and I can guide you step by step.
The book you are looking for is officially titled: by Claire Miquel, published by CLE International. Is there a legal, free PDF? No, there is no legal free PDF available directly from the publisher. CLE International actively protects its copyrights. You will not find a legitimate, free download of the full book on the publisher's website or through legal library platforms (like Cairn.info or Numilog) without paying.
Buy the physical or official PDF – it includes the audio CD (or audio download link) which is essential for pronunciation and listening at B2/C1 level. The book is worth the price for serious learners.