You can get the Server Agent software from the Downloads Page. This is where you can get the URL for the download if your server does not have a GUI.
Note: If you have a CentOS 6 machine, you will need to log into the Online Control Panel as the admin of the account. Here is the direct link to the Linux downloads page.
After grabbing the link address, go to the server and run the following command (examples are shown with 64-bit RPM download on CentOS):
wget https://downloads.jungledisk.com/current/junglediskserver.x86_64.rpm
After that, run this command to install:
sudo rpm -i junglediskserver.x86_64.rpm


After the installation, you will need to enter your license key into the license key file, located here:
/etc/jungledisk/junglediskserver-license.xml
You can edit the settings file using your editor of choice. For example:

Edit the license key file to replace "ENTER LICENSE KEY HERE" with the actual license key for Server Edition, available in the Manage Active Licenses section of the online Control Panel.

You can then run the following command to start the service:
sudo /usr/local/bin/junglediskserver