Why do I have to pay for this plugin? I have a subscription to year

Why do I have to pay for this plugin? https://premium.wpmudev.org/project/languages-for-wordpress-mu/?abdcd=b&utm_expid=3606929-22.9oyVajXiQKCMou5kcEqdCA.1&utm_referrer=http%3A%2F%2Fwww.zwierzak73.pl%2Fwp-admin%2Fadmin.php%3Fpage%3Dwpmudev-plugins
I have a subscription to october 2015...