Create a new user. It is recommended that the EngageReSS daemon is run under a dedicated user account (mostly because of the sudo requirement, see below).
Make sure that the setup.sh/setup.csh scripts get sourced for the new user. You should be able to run condor_q and condor_status. Also setup $JAVA_HOME and the $PATH so that java can be used on the command line.
You can use the home directory of the new user for the installation
Download and untar the latest version of EngageReSS: EngageReSS-0.4.tar.gz
Copy the template config file to the config file location
cp etc/engage-ress.con-template etc/engage-ress.conf
No changes should be necessary to the config file at this point.