Install softaculous in Cpanel

Log in to your VPS via SSH and execute the following commands one by one:

wget -N http://files.softaculous.com/install.sh 
chmod 755 install.sh 
./install.sh

After the installation is completed, Softaculous will become enabled in your WHM. Log in to your WHM and navigate to Plugins > Softaculous – Instant Installs. As you can see, Softaculous is enabled and please make sure that the license status is Premium