A frequent problem that occurs when installling Adobe Central Output Server is that sometimes a valid serial number is declined at install time. This most frequently happens when installing Central 5.5 on WIndows 2003.
Central 5.5 pre-dates the Windows 2003 operating system, which is not in the installer’s list of accepted OS’s.
To install correctly, you will need to copy the installer to a location on the local drive.
-Inside the installer directory, there is a setup.exe – right-click on this file and select the Compatibility tab
-Select Compatibility Mode for Windows 2000
-Repeat these steps also for the setup.exe in the Software\ directory
This will allow the correct recognition of Windows 20003
You do not need to repeat this for the installed binaries, these will accept the platform without any problems.