Our main plugin and our add-ons have been updated today to 2.0.1. This patches an issue with the load order of some woocommerce plugins and fixes the issue with the menu item not showing up in the nav for Designs.
Please update to current from your download links for our add-ons in your account page in our site, and deactivate, replace, and re-activate those plugins.
Also, please update your main NyStyle Custom Product Designer plugin through your WP admin (normal update link).
Make sure everything is version 2.0.1 or higher and you should be good to go.