The Version 9.1.1 of Rational Application Developer for WebSphere Software, Rational Developer for System z, Rational Developer for i, Rational Developer for AIX and Linux, Rational Business Developer, and Rational Developer for the Enterprise enable expanded usage scenarios and improved usability. Also, some capabilities and installation scenarios are deprecated.

The delivery modes for Version 9.1.1 are:

• Rational Application Developer for WebSphere Software and Rational Developer for System z provide a refreshed, full, Version 9.1.1 installable image and also deliver an update image through FixCentral that can be applied to an existing Version 9.1.0.x installation. Physical media kits are not updated with the refreshed, full-installable image.
• Rational Developer for i, Rational Developer for AIX and Linux, and Rational Business Developer provide a Version 9.1.1 update image through FixCentral that can be applied to an existing Version 9.1.0.x installation. These products do not provide refreshed full-installable images for Version 9.1.1.

Find out more here.