Rational Business Developer V126.96.36.199 is now available through Fix Central. All users of RBD V9.0.1 are highly recommended to install it.
The RBD 188.8.131.52 fix pack only contains APAR fixes. For the list of APARs in the fixpack, please go to the following link: RBD V184.108.40.206 Fix List
To find more information about the fixpack and how to download it, please go to the following link: RBD V220.127.116.11 Download Information
See the RBD V9.0.x Knowledge Center for any additional information.