The following links from the Internet Archive contain partial or seasonal content in Spanish (Castellano and Latin American) or related guides:

While specific individual uploads are often deleted, these general directories and search indices on the Internet Archive are known for housing larger Simpsons collections: simpsons-series directory

He opened it. It was the Season 4 episode "El Viaje Misterioso de Nuestro Homer" (The Mysterious Voyage of Homer)—but entirely re-dubbed by him. His own grunts, his own "¡Ay, caramba!", his own heart.

Existen varias opciones para ver capítulos completos de "Los Simpsons" en castellano:

The archive link wasn't a place to steal episodes. It was a mirror. And the only complete collection of Los Simpson en castellano was the one he had just lived.

The most legally and historically significant content found in archives involves recordings from the 1990s and early 2000s.