InstallAware for Windows Installer can import existing MSI setup packages and let you customize their behavior. You may also import non-MSI setups using the integrated PackageAware tool which works by monitoring the changes a setup makes to the system. Using the redistributable automation interface, you may remotely build your setups over web pages, or directly on end-user machine's at run-time.
Import and Customize MSI Windows Installers, Remotely Build Setup Programs 
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