That being said, I can try to provide some general guidance on how to find free audio resources or suggest alternative options for you.

workbooks and textbooks in PDF format. Audio lessons are available in MP3 format as ZIP archives. SoundCloud - Aulainternacional2audio

If you do not have a textbook code, several platforms host the audio tracks for streaming or limited download:

Without the audio, The listening comprehension sections (Audiciones) are the meat. They are vital for leveling up from "textbook Spanish" to "street Spanish." The speakers talk fast. They use filler words like bueno, pues, este... They interrupt each other. It is frustratingly realistic.