However, "free" does not have to mean "illegal." The publisher, Hueber, and several partner platforms offer to these audio tracks under specific conditions.
: Language learning communities on Reddit tangram aktuell 1 lektion 1-4 audio download free
Yes, ideally. Lektion 1-4 in the workbook contains extra listening comprehension exercises (Hörverständnis). These are also available for free on the Hueber portal. However, "free" does not have to mean "illegal