Thanks Pascal. Actually it is easy to install using PKG command. I complicated it . OK, For the benefit of others, here is the steps:
1. # pkg publisher
2. Check publisher name (Ex: pkg.oracle.com) is resolvable
3. # pkg install explorer --> Take few mins to install
4. # /usr/sbin/explorer -g --> Create default conf file
5. # /usr/sbin/explorer --> Create & Send (optional) the explorer log file.