Softaculous is an auto installer that contains lots of scripts. You can check the steps given below on how to install softaculous on a cpanel server.
Before installation you need to make sure that ioncube loader is installed and are enabled. You should select "cpanel php loader" as ioncube in whm --> tweak settings.
Now loginto server as root
Before installation you need to make sure that ioncube loader is installed and are enabled. You should select "cpanel php loader" as ioncube in whm --> tweak settings.
Now loginto server as root
cd /usr/local/cpanel/whostmgr/docroot/cgi wget -N http://www.softaculous.com/ins/addon_softaculous.php chmod 755 addon_softaculous.php
Now you can manage softaculous from whm
WHM > Plugins (Add-Ons on older versions than 11) > Softaculous - Instant Installs