use wget to download:
nethserver-phpmyadmin-1.1.0-1.ns6.noarch.rpm
phpMyAdmin-4.0.10.4-1.el6.noarch.rpm
php-php-gettext-1.0.11-3.el6.noarch.rpm
pwauth-2.3.10-5.el6.x86_64.rpm
mod_authnz_external-3.2.6-1.el6.x86_64.rpm
then:
yum localinstall nethserver-phpmyadmin-1.1.0-1.ns6.noarch.rpm \
phpMyAdmin-4.0.10.4-1.el6.noarch.rpm php-php-gettext-1.0.11-3.el6.noarch.rpm \
pwauth-2.3.10-5.el6.x86_64.rpm mod_authnz_external-3.2.6-1.el6.x86_64.rpm
I think it should be enough, if i miss some deps download it and add the filename to the yum command