If you're asking, can you download examples of programming code from Leanpub books, some Leanpub authors make their code available for download, and some do not; it's unique to each book, and each author.

If you're asking if you can download the manuscripts for books, we don't offer that.

If there is something you need or would like from a book that you can't find, you can contact the author of the book by going to the book's landing page on Leanpub and scrolling down until you see the "Email the Author(s)" button. You can use that feature to contact the author of the book.