This is one of the most common sources for the Zohar in Spanish. They offer the "Zohar con el comentario Sulam" (Ladder commentary), which is essential for understanding the text.
Because the Zohar is a massive multi-volume work, it is often available in two formats: a single large "complete" file or divided by sections (such as the Torah portions it comments on). Where to Download or Read Online: el-libro-del-zohar-completo-pdf
They often provide digital access or guided study versions of the Zohar, though some deep-access PDFs may require a free account. Important Note on the Text: This is one of the most common sources