I download this http://www.foobar2000.org/components/view/foo_out_wasapi
Then I extract the .dll to my foobar components folder. I have absolutely no idea what I am supposed to do with the exe files, except I know I need the 64bit version, because there is no documentation included. Even the documentation web page says nothing on how to install it. All this version of wasapi does is crash foobar (v 1.1.11) but I had no issues with the old version of wasapi that was just the .dll and no exe.