Impreza – Multi-Purpose WordPress Theme

You cannot install plugins from within the Impreza Addons page.
In the future: To install header builder plugin:
To null the theme so you can use the latest Header Builder is very simple.
You need to edit the file Impreza/framework/admin/functions/about.php
Around line 49 just before the closing php tag add

HTML:

update_option( 'us_license_activated', 1 );
update_option(...

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