If you rename or move Pages or Keynote 2 (applications in iWork) from their default folder location (Applications/iWork), you will not be able to install updates for either application. For example, if you rename Pages or move it from the iWork folder and then try to install the Pages 1.0.1 update, you may get the following error message:
Pages 1.0.1 cannot be installed on this computer. An eligible Pages application was not found in /Applications.
To prevent issues when installing iWork application updates, make sure that Pages and Keynote are in the iWork folder in the Applications folder and have not been renamed.