Here is the definitive workflow for legal download or access.
The publisher provides free MP3 downloads for owners of the physical or digital book. Aula Internacional 1 Nueva Edicion Audio Mp3 Download
Steps:
Alternative direct link (no code needed for sample tracks):
Sometimes Difusión offers the first few units’ audio for free on their demo page:
https://difusion.com/en/learn-spanish/aula-internacional-1
Look for "Recursos gratuitos" → "Audios." Here is the definitive workflow for legal download or access
The publisher, Difusión, has centralized all digital resources. Once registered, you can download all audio tracks
Note: Some codes expire after 12–18 months. If your code is invalid, contact Difusión support.