OnMsiSilentInstall
InstallShield 2024 » InstallScript Language Reference
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An installation program created by an InstallScript MSI project requires the end user to run Setup.exe. The OnMsiSilentInstall event handler responds to the end user attempting to run an InstallScript MSI project’s .msi database in silent mode with the /q option to MsiExec.exe. The default implementation is to display an error message and then abort the installation.