This page will provide you the path to Softaculous on your server.
For cPanel
/usr/local/cpanel/whostmgr/docroot/cgi/softaculous/
For Direct Admin
/usr/local/directadmin/plugins/softaculous/
For Plesk, ISPManager, ISPConfig, InterWorx, H-Sphere, CentOS Web Panel, Softaculous Remote, Softaculous Enterprise
/usr/local/softaculous/