After the first installation has been completed, by default, with the use of a transform file, the maintenance-change will not be able to use a transform file for deployment.
In order to perform a change on the current deployment, one will have to pass on the msi properties to msiexec.exe as command line arguments (separated by space. Values that contain spaces must be inbetween quotation marks)
In order to help the user, the Flowster Studio Setup.exe GUI will generate the list of arguments on the Create MST button in the Ready to install dialog.
Pressing the button will create a file in the setup folder with one of the names FlowsterStudioMainCommandArgs.txt/ FlowsterStudioComponentsCommandArgs.txt (depending on the type of deployment in place). Simply copy the contents and replace it in the command below under <list_of_arguments>
The command line to change the current deployment of Flowster Studio without UI is:
Msiexec.exe /i <path_to_msi> /qb <list_of_arguments>
For reference, the complete set of parameters can be found under chapters 5.3 and 5.4.

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