Installing Softaculous in cPanel.
Before installing the installation enable IonCube Loaders in WHM.
Go to Server Configuration -> Tweak Settings -> PHP Select ioncube check box for cPanel PHP loader. Click on Save button
Login to your server as root and enter following commands:
wget -N http://files.softaculous.com/install.sh chmod 755 install.sh ./install.sh
Now go to : WHM > Plugins (Add-Ons on older versions than 11) > Softaculous - Instant Installs