Can't install plugins from dashboard

When I try to install plugins from the dashboard I get an infinite loop. I click 'Download' on Hummingbird (for example), it takes me to https://premium.wpmudev.org/project/wp-hummingbird/ where I click 'Install' and select 'brentstromberg.com', it take me back to my site's dashboard with the modal window with the 'Download Plugin' button. I click 'Download Plugin' which takes me back to https://premium.wpmudev.org/project/wp-hummingbird/ where I click 'Install' and select 'brentstromberg.com', it take me back to my site's dashboard with the modal window with the 'Download Plugin' button, which takes me back to https://premium.wpmudev.org/project/wp-hummingbird/ where I click 'Install' and select 'brentstromberg.com', it take me back to my site's dashboard with the modal window with the 'Download Plugin' button...and this goes on and on and on. I can't actually install anything. I am in a 14 day trial and haven't been able to install a single plugin to test it out. How can this be resolved? And can my trial period be reset since I haven't been able to use anything?

Thanks!