Windows Installer (previously known as Microsoft Installer) is a software component and application programming interface (API) used for the installation, maintenance, and removal of software on Windows systems. It works with .msi package files, which contain all the instructions and data needed to install an application.
Windows Installer 5.0 (MSI 5.0) introduced several critical features for modern application management on 64-bit systems: Install Windows Updates - Microsoft Support
You may find "Windows Installer 5.0" downloads on third-party software sites. Use extreme caution with these, as they are not official Microsoft releases and could contain malware or outdated files that may damage your system registry. Always prefer official Microsoft Support for system file repairs. Informer Technologies, Inc.
How to check your Windows Installer (msiexec) version
He closed the ticket and watched the rain wash the city clean, ready for the next crisis.