This part is clear: the searcher is looking for a free version of the document in PDF format.
Assuming you are working with (e.g., a public domain text, an author-authorized free release, or a openly licensed edition), here is a draft write-up for the “Rey de la Reconquista” PDF, including the “patched by Álbu” note: libro rey de la reconquista pdf gratis patched %C3%A1lbu