UN Addon 2.0 Res....how does it work?

[unkie]

hi, i just spent a few hours dloading the UN Addon 2.0 for resistance and when it completed all i had was a file called "UN-ADDON_2.0_1.75.exe". when i click on this file nothing happens, i was just wondering did i dload a bad version or something? the file is 30.4 mb but i don't know what the hell to do with it.any help would be greatly appreciated