How to install 2 Services Desk Plus Application in to one server?

How to install 2 Services Desk Plus Application in to one server?

Hi,
Currently I want to separate SDP in to 2 systems with difference data and structure.
I tried to install another SDP in same server that currently running, but it always ask for uninstall the currently running.

Do you have any solution for this issue?

Regards,
SOPHAL