Support for the 7606-S was added in RME 4.0.6. You need to upgrade to Common Services 3.0.6 (downloaded from http://www.cisco.com/cgi-bin/tablebuild.pl/cd-one-3des ), then upgrade to RME 4.0.6 from Common Services > Software Center > Software Update. When on RME 4.0.6, go to Common Services > Software Center > Device Update, and download and install all available updates for Common Services and RME.
Updates are available for Campus Manager and DFM as well. they can be downloaded the same way as RME. the latest version of DFM is 2.0.12, and the latest version of Campus Manager is 4.0.12.
It will be much more inconvenient, but all of the software and device updates can be downloaded from http://www.cisco.com/kobayashi/sw-center/cw2000/lan-planner.shtml .