Windows Installer 5.0 introduced several technical improvements that are standard in Windows 10 64-bit: Install Windows Updates - Microsoft Support
Both tools restore corrupted msi.dll and msiexec.exe from Windows component store, effectively "reinstalling" Windows Installer.
– Some older applications check specifically for version 5.0 or higher. Since Windows 10 already meets that requirement, the error often stems from a corrupted registry or a disabled service.
Use a tool like (Microsoft MSI editor) to edit the LaunchCondition table. Remove or modify the condition checking the installer version.
If the installer is malfunctioning, you can reset its registration using the Command Prompt.
No. Windows Installer 5.0 is a built-in, native component of Windows 10. Unlike older versions of Windows (such as XP or Server 2003) where the installer engine had to be updated manually via a download, Windows 10 ships with Windows Installer 5.0 already integrated into the operating system. It runs as the msiexec.exe service.