Installation
Install to ~/.vim/autoload/pathogen.vim. Or copy and paste:

mkdir -p ~/.vim/autoload ~/.vim/bundle; \
curl -Sso ~/.vim/autoload/pathogen.vim \
    https://raw.github.com/tpope/vim-pathogen/master/autoload/pathogen.vim
If you're using Windows, change all occurrences of ~/.vim to ~\vimfiles.