If you are getting errors like "Windows Installer Service could not be accessed," you can reset it via the Command Prompt: Open CMD as Administrator . Type msiexec /unreg and hit Enter. Type msiexec /regserver and hit Enter.
Any bug fixes or security patches for the installer service are delivered automatically through Windows Update . How to Check Your Current Version Windows Installer 5.0 Download For Windows 10 64-bit
Windows Installer 5.0 introduced several key improvements for developers and users, which is why some modern apps require it: Install Windows Updates - Microsoft Support If you are getting errors like "Windows Installer
There is no official .exe or .msi file from Microsoft to "install" version 5.0 on an existing Windows 10 machine. Any bug fixes or security patches for the
Microsoft changed its distribution model starting with Windows 7. Because Windows Installer (MSI) is deeply integrated into the system's core, it is no longer released as a "redistributable" package.