I need to uninstall the current XCOM in order to install the latest version. However, I could not uninstall XCOM due to error " ......Failed to complete installation ". I am uninstalling XCOM from the Program and Features screen.
Here is the latest version of the Microsoft repair tool:
Fix problems that block programs from being installed or removed
for: Windows 10 Windows 7 Windows 8.1
Please download it from the Microsoft website and use this first.