Can't install plugins from the theme

[calderaprojects]

Hello Minti,

I am making a site for a customer with your theme Unicon.
The install of the theme was going well, but I couldn’t install 3 of the plugins that comes with the theme: Unicon Portfolio CPT, WPBakery visual composer and WooCommerce. I get an Error: Download failed. Authorization required as soon as I download one of them.
http://www.pixhoster.info/f/2016-08/50619ba0409871d9bf67bb3a672138a3.png

What can I do to fix this problem?
Thanks in advance!

Ticket