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I am using Confirm Email WordPress Plugin a paid for plugin from AppThemes Marketplace.

https://marketplace.appthemes.com/plugins/confirm-email/

dev build is missing for me as well.

Site appears to have been revamped, perhaps dev build download will be added.

mm, you can check this article http://sevenspark.com/wordpress/menu-item-limit for a solution and @joes post on wordpress.org it looks like a server setup issue.

This is more likely a Category limit on Wordpress menu's and not Vantage.

See: https://wordpress.org/support/topic/menu-item-limit-1

and you can find numerous other posts on the subject.