Could not run another process with elevated access after the Install Finalize action

[bhuvana-01m]

During Silent Mode:
Added a Custom Action(SilentLaunchSecApp) with deferred execute before InstallFinalize
Action SilentLaunchSecApp will try to launch the process(another msi) in silent mode
Error : Another Installation is in progress. You must complete that installation before continuing this one.

To overcome this Error ,
Added the custom action with immediate execute after InstallFinalize and this is not allowing the process to run in elevated mode.
While executing in silent mode , the UAC prompt is not allowed to trigger hence its will try to run the process and exited with error says "Ensure that the process running the MSI installer has sufficient permissions"