try creating a custom action to call the setup.exe, you can do so with the following silent switch "/script v2admin.ini /NoUserInput /hidden". The v2admin.ini is used to configure the installation
[Identification]
Action=InstallAdminUI
[Options]
FullName=
OrgName=
ProductID=123-4567890
SMSInstallDir=C:\Progra~1\SMSADMIN
SDKServer=
OptionalUnits=