The installer also came up with a useful feature called MsiLockPermissionsEx which is used to secure services like new accounts, registry keys, files, and folder. As compared to the older versions of InstallShield Microsoft has made some important changes in the recent version of Windows Installer 4.5 and 5.0.
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Download Windows Installer 4.5 Redistributable: Link
Windows Installer Version 5.0 Auto Update: Link
Windows Installer Version 3.1: Link