The most crucial fact about Windows Installer 5.0 is that . Microsoft's official documentation clearly states: "There is no redistributable for Windows Installer 5.0. This version is included with the OS in Windows 7, Windows Server 2008 R2, and later client and server releases (including Windows 10)."
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 .
This is the safest and most recommended method, as it automatically detects and fixes many common issues.
Click , type cmd , right-click it, and select Run as Administrator . Type msiexec /unreg and press Enter . Type msiexec /regserver and press Enter .
Then type the following command and press Enter: