The WP Bakery templates are a feature available for users that have purchased the plugin. You need a personal license to have these.
BUt theme has already many ready-to-use templates that you can add in your pages. See screenshot: https://ibb.co/smKcjc9
Page: Codeless slider test.
Yes, i checked with the developers and it seems to have a bug. We have already added this in the to-do list for the next theme update. For now, you have to manually add it.
