If you are unable to run the Installer or you are missing a file after installation, then your anti-virus software falsely labeled it as a virus.
In this case you have to add the entire Game Folder UMF is installed into as an exclusion in your Anti-Virus software.
This covers Microsoft Security Essentials for all Windows versions before Windows 10.
It is recommended you upgrade to Windows 10.
If on Windows 7 or newer, the default Windows AV will now enable it self again.
In case of older versions of Windows or the the default not enabling it self again, you should install Microsoft Security Essentials for some protection.