Offline Installation

Is there a offline installer? I had DevKit on my D drive, I wanted to move it to my C drive, but it redownloaded it, took quitea few hours for me (2MB/s), is there a offline installer? Or a way to move the installation without redownloading for 6+ hours?

This is 100% possible - there is a thread open on here of how to move your installation from point A to B.