Hi Masuoumeh,
Xcelsius 2008 is supported for Business object XI 3.1.
Whereas If you are using SAP Business objects 4.0 or 4.1, SAP Dashboards 4.0 and 4.1 are supported respectively.
In order to install Xcelsius 2008\Dashboards there are certain pre-requisites which needs to be installed on the machine.
1. Adobe Flash player
2. Microsoft office.
The version compaatibility of the above the tools with your xcelsius tool can be found out in the PAM\Supported platform guide. you could refer to the link provided by Suman.
Hope this Helps!!
Regards,
Noopur