If you are hunting for your best bet is to accept the low-resolution graphics of the official free client. It guarantees you a clean game, free of viruses, with the official Spanish translation intact.
Fixes for the "rainbow color" glitch seen on older versions. If you are hunting for your best bet
Aquí tienes los pasos detallados para bajar la última versión oficial en español: 1. Descarga desde Battle.net (Método Oficial) free of viruses