cant install plugins – just being forwarded to wpmu site

After installed DEV Dashboard plugin, I am trying to install other plugins. eg “Branding”.

but when I click on plugin from “dev dashboard” i a being forwarded to these pages in and endledss caroussel:

start:

http://wp.devel.natsort.dk/wp-admin/network/admin.php?page=wpmudev

https://premium.wpmudev.org/project/ultimate-branding/

http://wp.devel.natsort.dk/wp-admin/network/admin.php?page=wpmudev-plugins#pid=9135

etc.