Linux Agent for Backup Exec 21?

Hi,

I'm using the trial version of backup exec. For a school project i need to setup a backup server that will backup data from both a windows client and from a linux client... all the machines used for this project are on AWS. I was able to install/setup the agent for my windows client and to link it with the server ... but how can i install the linux agent on my linux machine? When i try to add my linux client from my server backexec interface, it fails and i'm being told "...a backup agent is not installed..." but i can't seem to find where to download and how to install the linux client...