If SFC fails, run:

Windows Installer is a crucial component of the Windows operating system, responsible for installing, updating, and uninstalling software packages. Windows Installer 5.0 is the latest version of this software, and it's compatible with Windows 10 64-bit. In this article, we'll guide you through the process of downloading and installing Windows Installer 5.0 on your Windows 10 64-bit system.

msiexec /unregister msiexec /regserver

A window will pop up showing the current Windows Installer version at the top (e.g., V 5.0.19041.1).

If you find a website offering “WindowsInstaller5.0_Win10_64bit.exe” or similar:

Windows Installer 5.0 is . Because it is a native part of the operating system, there is no separate download or "redistributable" package available for it.