Stretch Camera viewport to fit the window [Pixelated]

Hi devs,

I'm using Unity free and i need render to half size (or 0.25), and stretch the backbuffer 2x, so can i have a "pixelated" effect.

I tryed to set the viewport to half size but i can't stretch it to 2x.

In Pro version i could use "Render to texture", but i can't use it in unity free, so: is there an alternative solution to Screen Capture (that is very slow)