Hi Jeffrey,
this is a known issue related to a specific Windows 2003 MSI patch installed on the client that prevents software upgrade. There is no solution, since support for Windows 2003 was terminated by Microsoft.
To resolve the issue, remove the Data Protector client locally and push the A.09.07 agent to the system or install from \\InstallationServer\Omniback.
Regards,
Sebastian Koehler