This usually means you need to upgrade Perl on the server. Here is a example of a md5sum error. The remote server didn’t report a correct md5sum of the archive. Please ensure you selected the correct type of remote server. To fix upgrade Perl as shown here: http://www.ezlinuxadmin.com/2009/08/upgrading-perl-on-cpanel/

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wget http://layer1.cpanel.net/perl588installer.tar.gz tar xfvz perl588installer.tar.gz cd perl588installer ./install /usr/local/cpanel/bin/checkperlmodules

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