I've made a new tutorial for up scaling in real fullscreen mode. This is much simpler and performance friendly compared to previous tutorial. Of course you can't Alt Tab instantly now. But this is for Fullscreen users. See the first Post for further informations.

Tips: Incase you don't know, hovering the mouse over the screenshot's/images will enlarge it to it's actual size.

Hold Shift and then move the mouse wheel to scroll horizontally or Press/click the Mouse wheel and move freely.

The .gif tutorial's speed is 2 seconds. I know it's a little pain

But it's not much hard anyway. After seeing 2-3 times, you will already know what to set.

Edit: DXGI worked too. But there were far too much artifacts.