After installing, you can’t see the add-ons and the Sike Extensions menu?
After installing and activating the plugin, go to the dashboard, then the Wordpress Settings menu, then select visual composer.
In the “User groups access rules” section, select the Administrator Accordion so It drops down. Scroll to the bottom and choose select all, then save the changes. This should add the new extensions to Visual Composer.
I’m guessing that you can remove unused ones from view this way as well.