I think you have used an incorrect way to install the premium version.
To use the Premium version you have to:
Get the purchased product by clicking the “Download” button on the right sidebar.
Check for free version of theme or install the Tempo free WordPress Theme and update if needed.
Go to Admin Dashboard › Plugins and here Select Add New
Install the downloaded plugin zeon-[ver].zip and activate it. We use a plugin so you do not lose data or customizations on upgrade ( in case you previously tried our free version ).
Start using extended features with the Premium Version.
Also you can use the purchased plugin to extend Tempo and Tempo child Themes.
IMPORTANT: – Install the plugin zeon-[ver].zip as a plugin ( not as a theme ) and also is important to have installed the free version of Tempo. These 2, Tempo and Zeon, work just together as a premium version.