Para responder a essa pergunta, as instalações são feitas no OSX. Depois da linha de comando eu corri:
which vagrant; #/usr/local/bin/vagrant - I might want to move to global scope, something to be aware of
vagrant -v #1.9.1
which virtualbox; #/usr/local/bin/virtualbox
virtualbox -v; #well this didn't work :) it opened VirtualBox UP, but I used About this Software to get the version - 1.9.1