Just about anyone who has ever installed a WebSphere based product will be familiar with the Update Installer – a separately installed mini-application that provides a GUI (plus command-line and silent installer) for WAS and WAS ND amongst other applications.
Searching for a version for AIX on FixCentral I noticed that the Update Installer was not listed, which I’m sure used to be the case.  Instead, it must be downloaded from this page:
Update Installer for WebSphere Application Server V6.1 and V6.0.2.21 (onward)
Abstract
You can use the Update Installer V6.1.0.19 to install maintenance and updates for both IBM WebSphere Application Server V6.1 and V6.0.2.21 onwards with some exceptions.
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Download Description
In order to enhance usability and provide a smaller tooling footprint, there is a new strategy for the Update Installer that eliminates the need to install multiple instances of the tool. A single instance of the V6.1 Update Installer can now apply maintenance to all WebSphere Application Server V6.1.0 (any fix level) and any newer maintenance from WebSphere Application Server V6.0.2.21 onward.
See the Supported platforms table for information on Update Installer V6.1 compatibility with WebSphere Application Server V6.0.2 platforms.
The latest version for most platforms is 6.1.0.19, and this is the release to use when upgrading the standard WAS install to 6.1.0.23 as required by Lotus Connections 2.5, for example.
The Update Installer V6.1.0.19 has the following functionality:
  * A GUI and a command-line Update Installer
  * Installation and removal of individual and/or multiple code updates
  * Logging, recovery features and prerequisite handling
  * Compatibility with previous releases in certain cases
Link: Update Installer for WebSphere Application Server V6.1 and V6.0.2.21 (onward)
