Some of our digital patterns and ebooks are delivered as a single zip file containing two or more PDFs. The iPad cannot download zip files on its own, but there are two ways to handle this:
1) Download the file to your computer, unzip it there, and copy the PDFs to your iPad. Current versions of Windows, Mac OS X, or other operating systems will usually unzip these files automatically when you download them, but you occasionally may have to locate the file in your Downloads folder and double click it to open it.
2) Install an app on your iPad that provides this functionality. WinZip is a free app that can handle this for you.