For about €19, buy the physical book. Lidel provides a code or a link to download the audio tracks (the listening comprehension exercises) for free.
But here is the problem most students face: finding the online is difficult. Many links are broken, malicious, or simply illegal. gramatica ativa 1 pdf
In this post, I will explain exactly what this book is, why it works, where you can legally get a digital copy, and how to use it to actually speak Portuguese. For about €19, buy the physical book