When you purchase Companion from ThemeForest you can download the theme package through the Downloads menu on your ThemeForest account. You have two download options to choose All Files & Documentation or the Installable WordPress File Only.
How to download Companion theme
Login to your ThemeForest account and navigate to the Downloads menu in the profile icon at the top-right corner.
On the opened page, find the Companion purchase, click the Download button and from the dropdown, choose All Files & Documentation or Installable WordPress File Only.
Included files in the ThemeForest package
Bundled Plugins: This folder contains all the included plugins
Companion Elementor Widgets
Companion Configurations
companion.zip - This is the Companion theme installable WordPress file that you need to upload and install
companion-child.zip - This is the child theme you can upload and activate to apply custom modifications to the core Companion theme files.