Alternative: Upload via FTP
In case you wish install the theme via FTP, proceed as follows:
Unzip TheGem_Elementor.zip (for Elementor version of TheGem) OR TheGem_WPBakery.zip (for WPBakery version of TheGem)
Login to your hosting space via an FTP Client
Upload the whole contents of the unzipped file into wp-content/themes/ folder under your WordPress installation.
Once you’ve uploaded the theme you can open Appearance → Themes page and activate the theme from list. After that you need to install and activate the plugins as described above.