You can obtain a copy of the latest version of the MNI_ANIMAL software using anonymous FTP from:
mni_animal-x.yy.tar.gz (where x.yy is
the release number). You'll need mni_animal-0.5.tar.gz with
mni_autoreg-0.98d.tar.gz or mni_animal-0.6.tar.gz with
mni_autoreg-0.98e.tar.gz.
MNI_ANIMAL requires MNI_Autoreg, since MNI_ANIMAL is essentially copied
and built on top of the MNI_Autoreg package (see the
MNI_AutoReg
home page; you'll need
mni_autoreg-0.98d or later). The MNI_ANIMAL package replaces the
minctracc program and contains scripts to do non-linear
registration.