Hi
In the download section of GK framework: https://www.joomlart.com/member/downloads/gavick/free-joomla-templates/gk-framework
The first 2 packages are quickstart packages which are used for a brand new website only in which it includes Joomla installation + sample data so it will look like our demo setup.
If you already have Joomla installed, you should download template package + plugin:
GK Blank Template
Gavick System Plugin
and install each package via Joomla installer in backend of your site.
Check out this documentation for more info: https://www.gavick.com/joomla-templates/gk-framework/install#manual-installation
Regards