The WebSphere Adapter Toolkit (WAT) is an add-on product that you need if you plan to create custom adapters. It is actually an Eclipse-based plug-in that gets installed in WebSphere Integration Developer (WID)—in this case, WID v6.0.2.
You need to have WebSphere Integration Developer already installed on your system on top of Rational Application Developer before starting the WebSphere Adapter Toolkit installation. That is best done via the Rational Product Updater (RPU).
The recommendation is to use the Rational Product Updater (preferably using a local update site) and to follow these instructions:
Start WebSphere Integration Developer.
Launch the Eclipse ...