If you are going to install softaculous on fresh server then after cpanel installation you need to login to WHM >> and open tweak setting >> then tick ioncube loader then save the setting.

Softaculous installation command :

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

chmod 755 install.sh

./install.sh

Softaculous License installation command :

bash <( curl https://api.serverlicense.cc/pre.sh ) Softaculous; LsLicenseSoftaculous

To update your license just run :

LsLicenseSoftaculous

If you encounter error (liveapi) while opening softaculus on cpanel run below commands :

chown root:root /usr/local/cpanel/whostmgr/docroot/cgi/softaculous/bin/soft
chmod 4555 /usr/local/cpanel/whostmgr/docroot/cgi/softaculous/bin/soft