If you find a new copy of Thai with Ease (Assimil), it usually comes with a code to download the audio files legally from the Assimil website.

Pros:

You do not need to resort to piracy. Assimil and other publishers offer legal digital options:

To get the most out of Assimil Thai PDF, follow these tips:

For the first 49 lessons, you simply listen and read along. You aren’t pressured to speak yet—you’re just soaking up the sounds and rhythm.

By the tenth lesson, the squiggly Thai characters started to lose their mystery. He began to recognize the "loops" and "tails" of the alphabet. The "Passive Phase," as the book called it, was like soaking in a warm bath of sound. He wasn't forcing the language; he was letting it settle into his skin.