If a program is giving you an error related to the Windows Installer, you should first verify which version is currently active on your 64-bit system: Press to open the Run dialog. Type msiexec and press Enter .

Run System File Checker:

Before attempting any fixes, verify the exact version of the installer engine currently running on your Windows 10 64-bit machine. Press the to open the Run dialog box. Type msiexec and press Enter . A window will pop up titled Windows Installer .

: In the Command Prompt window, type the following command and press Enter:

How can I install the windows installer 5.0? - Microsoft Q&A

If you are looking for a download because your installer is broken (e.g., "The Windows Installer Service could not be accessed"), try resetting it instead:

Restart your computer and try installing your software again. 3. Use the System File Checker (SFC)

These features are already available on your Windows 10 64-bit system through the built-in Windows Installer 5.0 component.

If you are packaging software or maintaining enterprise systems:

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

Note: As of 2026, there is no standalone redistribution package for Windows Installer 5.0 for Windows 10. According to Microsoft Learn , this version is pre-installed with the OS. What is Windows Installer 5.0?

Support for installing applications specifically designed for Windows 10 on Arm64 processors 1.2.2 .