the slightest idea is good
I would like to help you with your issue, but I am afraid I cannot understand your question.
Could you please clarify?
If you are trying to run the installer from a network share, usually there will be permission issues when LocalSystem tries to run it from the network.
I would change your package so that you add the installation files as additional files to the SWD package, and then change your vbscript so that it runs them from the local machine.
Try that, let me know how it goes.