The PDF is elusive. Your best bet is not a random website, but searching used book sites (Iberlibro or Mercado Libre) for the physical "Editorial Kier" edition. Until the Foundation releases an official eBook in Spanish, the complete digital version remains the greatest ghost in alternative history.
AquΓ te dejo una guΓa adecuada para encontrar este texto: la biblia de kolbrin completa en espanol pdf better