Unknown sources installation not working...

Ok....I'am trying to install a sprint app that didn't come with my sprint Google nexus, and the only way to get it is to download it is through a unknown source. I have already checked the unknown source box, but every time i get to the screen to install, the button to install wont work. Its like something in blocking it, no message shows up or anything it just doesn't work .....can anyone help?

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