Im on a UNIX system and I can untar the download. Why?
Some of the files in the tarball have very long pathnames, too long for the standard tar format. You must use the GNU version of tar instead (or another program which understands the GNU tar extensions). On some systems, the GNU version of tar is available under the name “gnutar”. You can find out if you are already using the GNU version by typing tar –version and seeing if the output says “tar (GNU tar)”.