Downloaded version of game from amazon cant install 3.19

[Underdog Ally]

Hello, I have a non-disc version of civ 4 which i bought and downloaded from amazon. I am trying to get mods, but none of them will install because they say i need to update to 3.19. Within the game it does say 317, but based on the rules it does behave as though it is 319. Furthermore, when i do download and try to install the 3.19 patch all it does is try to uninstall the game itself. I am on windows 8.1, i am starting to think i will never be able to play any mods.

**RESOLVED**