Theme update process is quite similar to Essence theme Install, you can update them in your Quizier admin. Follow the instructions below:
INFORMATION: Theme update may require you to have some specific version of Quizier that is why it is important to always have the updated version of Quizier.
Log in to your Quizier admin page, then go to Appearance and select Themes.
To update a essence theme, click Upload Theme.
The theme upload form is now open, click Choose File, select the theme zip file on your computer and click Install Now.
You will not lose any settings during update process after clicking Install Now system will automatically update your theme.
NOTE: Theme options is available from version 5.0.2 if you have older version make sure you update your Quizier website.