start AutoHotKeyu64.exe wm4k.ahd should launch it.  both of the files in this gist should be in the same directory.
with NUMLOCK off, pushing number keys will move windows around.  8 will resize a window to fit 1/8th of your screen (1/4 width, 1/2 height.)
Similar operations for 1, 2, 3, 4, and 6.  CTRL does things in combination with 3, 4, and 6, so try those.
Numpad * (with numlock off, always) will arrange a window to occupy 1/12th of the screen (1/6th horizontally and 1/2 vertically).
NEW - Numpad+ and Numpad- will adjust a window's position horizontally