FYI - there is something wrong with the FTP server:

$ wget ftp://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/5.3.0-HCP/freesurfer-Linux-centos4_x86_64-stable-pub-v5.3.0-HCP.tar.gz

--2016-09-15 20:04:51--  ftp://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/5.3.0-HCP/freesurfer-Linux-centos4_x86_64-stable-pub-v5.3.0-HCP.tar.gz

           => 'freesurfer-Linux-centos4_x86_64-stable-pub-v5.3.0-HCP.tar.gz'

Resolving surfer.nmr.mgh.harvard.edu (surfer.nmr.mgh.harvard.edu)... 132.183.202.158

Connecting to surfer.nmr.mgh.harvard.edu (surfer.nmr.mgh.harvard.edu)|132.183.202.158|:21... connected.

Error in server response. Closing.

Retrying.

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