Hi Ajitabh,
Your Current SAP Business Objects 4.0 then you can use both the version.
- BOBJ Xcelsius Enterprise 2008 (Old Version of Dashboards)
- SBOP Dashboard 4.0 (New version of Dashboards)
For Installation steps please refer below Links:
Installing Xcelsius 2008:
Links:
http://scn.sap.com/docs/DOC-25567
Installing SAP BusinessObjects Dashboards 4.0
Links:
http://scn.sap.com/docs/DOC-25568
Dashboard Design 4.0 SP05 (New HTML 5 Features) installation
Links:
http://scn.sap.com/docs/DOC-33372
and regarding SAP Business Objects Explorer is Server based component so it was by default available in your BOBI 4.0 Installation.Please check with below url
http://<servername>:<portnumber>/explorer
Hope this will help you as well.
Thanks,
Daya