When you choose to print a book, you will have an option to print it in booklet format.
When you go to download your book, you can choose to download as a PDF or word doc. If you select PDF, the download is not in a traditional booklet pagination format.
Much of the time, if you open the PDF in Acrobat or Reader, you can select "Print," choose "Booklet" from the Page Sizing & Handling section, and then select your printer settings (duplex or manual printing)
If that doesn't work, we recommend selecting download by pdf and then using the software linked below to convert your pdf document into a traditional booklet: