1. Open Themeforest Downloads Tab and download Installable WordPress file only

You’ll find a zip folder who’s name starts with themeforest, and the flatsome folder within it.
Add to zip the flatsome folder to use it in WordPress Dashboard

2. Installing the theme process is friendly and very simple, but a little bit different than for other WordPress themes. I walk you through the next steps in the following video using a fresh WordPress install.
3. A couple of notes after installing process: