Where do I find Visual Composer License Key?

We don’t provide license key of Visual Composer in download package, you can’t find it in your package downloads. Visual Composer (We bought extended license of this plugin) but current have note solution for activate with this plugin. license key only can activate 1 time
We created new ticket on http://support.wpbakery.com/ and here is the answer from developer of Visual Composer

It is not possible for theme buyer to activate the license (and hence to auto-update the Visual Composer) as they have not purchased the license directly from us, but has received it in-directly from the theme. In this case, you must update the version in the theme and must release a theme update which the buyers can download and hence in-turn will receive the latest version of Visual Composer.

We’re sorry about this inconvenience but we will update our themes to run follow Visual Composer updates.