After downloading the installable WordPress file from ThemeForest, you can install the theme in a couple of ways.
Install via WordPress
Log in to your WordPress admin area
Browse to “Appearance > Themes”
Click on “Add New”
Browse and select the theme zip file to upload
Install required plugins
Once installing the theme, make sure to install required plugins. Click "Begin installing plugins" and wait for them to be installed. Once you get a success message for each, everything is installed and ready to go.
Potential issues that you could face and their solution
If you get an error while trying to install the theme or plugins, it is likely that you have an older PHP version that the theme does not support. MyListing requires PHP 5.5+, while we recommend PHP 7+. You can update your PHP version under your hosting dashboard/cpanel, usually under PHP options.
If you get a stylesheet could not be found error, it means that you are uploading the wrong file, make sure to only upload installable wordpress file.