No necesitas instalar programas pesados; actualmente existen plataformas en la nube que permiten generar estos audios directamente desde el navegador:

Loquendo technology converts written text into human-like audio. It gained massive popularity in the early 2000s on platforms like YouTube for its distinct "robotic" Spanish and English narrations. Today, "Loquendo" is often used as a generic term for any high-quality Text-to-Speech (TTS) service. Top Platforms for Free Loquendo Voices

Is using Loquendo online gratis legal? Technically, no. Loquendo is copyrighted software. However, since it is no longer sold or supported, most companies do not enforce copyright claims against non-commercial users.