Windows Installer 5.0 is already built into Windows 10 as a default system component. There is no standalone download or redistributable package available for Windows Installer 5.0.
Windows Key + R on your keyboard.msiexec and press Enter.Installation Complete.
Windows Installer 5.0 was introduced with Windows 7 and is the native installation engine for all subsequent versions, including Windows 10. Microsoft Learn Integrated Component windows installer 50 download for windows 10 64bit new
If you are trying to find "Windows Installer 5.0" because you are getting an error or a program says it is missing, you do not need to download it. Instead, you can ensure it is working or update your entire system. How to Fix Windows Installer Issues Windows Installer 5