If the number starts with 5.0 , you already have Windows Installer 5.0 or a later build of it. The number after the second dot (e.g., 19041 ) indicates the OS build version, not the installer version.

However, there is a major misconception regarding how this software is distributed. You cannot download Windows Installer 5.0 as a standalone package for Windows 10.

If you are experiencing issues with installations, it is highly likely that your Windows 10 is missing updates, rather than the installer itself needing to be downloaded. Steps to Update Windows Installer: Open the and click Settings (gear icon). Navigate to Update & Security . Click Check for updates .

No separate download is available—nor required.

To reiterate: —because you don’t need one. Windows 10 includes Windows Installer 5.0 (or a superior version) by default and keeps it updated via Windows Update. If you are experiencing installation errors, the cause is almost certainly a corrupted service, a misconfigured registry, or a badly authored MSI package—not a missing installer version.

Handles both per-user and per-machine installation triggers smoothly. How to Fix Windows Installer Errors on Windows 10 64-bit