IBooks
I want to download iBook for I pad1 and other app , I know iPad 1 can't update to os7 but why can't use old app ? What do you want me to do ? Just throw it to your Face?
iPad, iOS 5.1.1
Download it using iTunes on your computer. Once you've done that, open the App Store on your iPad and tap the Purchased section. Tap the cloud/download icon and you should be asked if you want to download an older version.