> tar -jzvf cealign-VERSION.tar.bz2 > cd cealign-VERSION > sudo python setup.py install > cat ./PYMOLRC >> ~/.pymolrcThe installer needs to edit their /.pymolrc file (or Mac/Windows equivalent) if s/he wants PyMol to automatically load the cealign extension. Please edit the PYMOLRC file before executing the last command. Change, the directory from where PyMol should run the script.