I hope you have this problem resolved by now, just the same if anyone else is having this issue, my mistake was choosing the "Just me" option when I initially installed GIMP. That placed the entire ...

get-pip.py install [options] [package-index-options] ... get-pip.py install [options] -r [package-index-options] ... get-pip.py install [options] [-e] ... get-pip.py ...