to use, navigate here in your files vvvv
%APPDATA%\Blender Foundation\Blender\[YOUR VERSION]\scripts\presets\interface_theme\
then drop the XML file in that folder, and it should show up in the presets menu.
unfortunately i cant include the font on here since i paid for it, but it should be easy to find a good pixel style font! you can change blenders font in the preferences as well, its not in themes tho you scroll down to "file paths" and do it at the top of that screen