It seems you are looking for a PDF of the Spanish translation (by Pedro Ribas) of Kant’s Critique of Pure Reason (Crítica de la razón pura), published by Editorial Gredos, specifically related to tomo/volume 13 of their collection.
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Estructura y Contenido
Below is an overview for a paper or study based on the "Gredos" version of this work. Core Themes of the Work Transcendental Idealism It seems you are looking for a PDF
Note: While digital copies exist for academic preview, the density of Kant's prose often makes the physical Gredos volumes—famous for their white covers and elegant typography—a superior experience for deep study. published by Editorial Gredos
Ediciones y traducciones