In Documentation there are explained 3 ways of updating theme: 1. With Envato Market plugin(auto updates). 2. With Easy Theme and Plugin Upgrades which is fine, and works correct even now that it is not updated(as it doesn't need to). 3. Doing manually what Easy Theme and Plugin Upgrades would do - deleting old version of the theme and uploading a new one. All theme settings are stored in database, so you don't need to worry.
Comments
Everything about Updating theme can be found here http://rifetheme.com/apollo13-framework/docs/installation-updating/updating-theme/
You will not lose custom CSS & settings.
With kind regards.
The installation of the theme failed.
In Documentation there are explained 3 ways of updating theme:
1. With Envato Market plugin(auto updates).
2. With Easy Theme and Plugin Upgrades which is fine, and works correct even now that it is not updated(as it doesn't need to).
3. Doing manually what Easy Theme and Plugin Upgrades would do - deleting old version of the theme and uploading a new one. All theme settings are stored in database, so you don't need to worry.
Please proceed as I advised.
With kind regards.