When you say that you "downloaded" do you mean you received a zip file via your iPad's Mail App or something else?
If the file is on your iPad you can use the GoodReader App (available in the App Store) to open and view the contents, and then you can copy/paste them in to Pages, etc.
There are also apps specifically designed to deal with Zip files. Use the Google search field in the upper right-hand corner of this page to find them.
Or did I misunderstand?