ByPass Android Alert "Downloading from Unknown Sources"

Hello,

Does anyone has a key for bypassing android alert "Downloading from Unknown Sources". If you do, can you guide me on this.. Let us discuss if you has vague idea of how these things are done. Usually, I have seen it happen, since hackers do this on a daily basis.

No, I am not trying to gain any illegal access.. neither am I trying to do something shady more than usual we do here. I am just trying to bypass that android feature so the conversions are more for app download from my link.
The link is already cloaked.

Thanks..