why the WPBakery page builder plugin is not getting installed?

Why the WPBakery page builder plugin is not getting installed?
This is the msg it shows;
An error occurred while installing WPBakery Page Builder: Download failed. Not Found .

Hi @migyle,

Please contact the author of your purchased theme, the theme author will assist you.

How to contact an author to get support or for any technical query:

Also you can check the theme documentation hopefully you will get necessary help.

Thanks