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:
Now go to : WHM > Plugins (Add-Ons on older versions than 11) > Softaculous - Instant Installs