Installation of the sample content is simple, but must be run as the root user from a bash prompt on the Avalon system. The process for this depends on which kind of installation you have.
Once you have a root prompt, run rpm with the correct rails environment (RAILS_ENV) for your setup and the correct URL for your version.
#For pre-R3 installs: RAILS_ENV="production" rpm -i http://www.avalonmediasystem.org/downloads/avalon-sample-content.noarch.rpm
#For R3 installs: RAILS_ENV="production" rpm -i http://www.avalonmediasystem.org/downloads/avalon-sample-content-3.0-1.noarch.rpm
If the install fails and you need to rerun the installation, add the --force flag to the rpm command.