wget -c ftp://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/5.2.0/<filename>

    wget \
      --recursive \
      --no-clobber \
      --page-requisites \
      --html-extension \
      --convert-links \
      --restrict-file-names=windows \
      --domains website.org \
      --no-parent \
      www.website.org/tutorials/html/

Options used:

- `--recursive`: download the entire Web site.
- `--domains website.org`: don't follow links outside website.org.
- `--no-parent`: don't follow links outside the directory tutorials/html/.
- `--page-requisites`: get all the elements that compose the page (images,
  CSS and so on).
- `--html-extension`: save files with the .html extension.
- `--convert-links`: convert links so that they work locally, off-line.
- `--restrict-file-names=windows`: modify filenames so that they will work
  in Windows as well.
- `--no-clobber`: don't overwrite any existing files (used in case the
  download is interrupted and resumed).