If you click download for PDF, it will open in the Safari browser. If you don't want to read it online, click on any page and a pop-up button will appear in the top right corner of the window that says, "Open in..." Select the app you would like to use and the PDF will automatically open in that app.
Before you transfer the book, you must complete some steps:
There are three ways to transfer an e-book from your computer to your iOS device: