Plugin WPBakery Page Builder

Dear all
Until now I bought in the last years 11 times the theme Unicon for my clients (different projects), every time with a new license.
Everything works perfectly. The only thing is, that the Plugin WPBakery Page Builder can not be updated.

I also tried once to buy with another email a license directly on the website of WPBakery Page Builder. But I can not activate/update the existing Plugin in the theme Union.

How can I update the plugin WPBakery Page Builder in all my websites? Could you do that for me?
Thanks a lot for your help. Kind regards. Dario

Ticket