As of OIM 11g R2, Design Console is still required for some functionality (although it is reportedly being phased out with its functionality being rolled into the web-based system admin app). Starting with OIM 11g, there was no longer a standalone installer for Design Console. Instead, you must install the full IAM suite and configure only the Design Console component. However, a problem arises when you want to install into a Middleware Home that does not already contain Weblogic. If you’re installing into a new Middleware Home, for example /apps/oracle/Middleware/, and Weblogic has not already been installed, you will see this error:
At first glance, one might think that you have to install Weblogic. However, this is a workaround that’s quick and painless. It turns out the installer is merely checking that the directory is not empty! Simply create a dummy file in your desired Middleware Home location and the installer will proceed normally.