But with buying your own Visual Composer plugin you will have almost no advantage, the only advantage you get is automatic updates of Visual Composer.
Statement from Envato
Since Envato doesn’t have a “multi-use” or transferable license, your customers are not entitled to receive an Item Purchase Code with your theme and use the plugin separately from your work.
Manual Update of Visual Composer
You can always do manual update of Visual Composer plugin so here are instructions:
1. Go to wp-content/themes/agama-pro/framework/plugins/ folder.
2. Copy js_visual.zip file to desktop or somwhere on your PC (we always bundle newest version of Visual Composer).
3. Go to your WordPress admin dashboard Plugins page & delete Visual Composer plugin.
4. Install new Visual Composer plugin.