The ANL moab site (https://trac.mcs.anl.gov/projects/ITAPS/wiki/MOAB) has an issue regarding the tar.gz available. The tar.gz's for moab-4.6.0, moab-4.6.1 and moab-4.6.2 all point to the same url, which all point to the 4.6.0 version. Thanks Andy