Libraries are for Windows Installer to install patches and security updates, and some applications, including Microsoft, whose installation files have the extension MSI. Both the amendment and the stand-alone applications to extend the MSI is a much smaller size compared to EXE files because they contain their own installer – what role does the Windows Installer. These libraries in version 3.0 are required to install many programs, and including update service.

Download Windows Installer 3.1 Redistributable

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