Use an SSD: Installing Unreal Engine on a Solid State Drive significantly reduces the time it takes to compile shaders and open projects.
If you are writing a "paper" or report on this version, here are the major milestones introduced in 4.12: Unreal Engine 4.12 Released! Unreal Engine 4.12 Download
Click the version number on the newly created gray slot. A dropdown menu will appear. Scroll through the list until you find "4.12.5" (the final and most stable patch for this branch). Click "Install." Technical Requirements for UE 4.12 Use an SSD: Installing Unreal Engine on a
: You will likely need Visual Studio 2015 for C++ projects, as newer versions may cause compatibility errors. Unreal Engine 4.12 Download