1) Login to your Envato account and download the Qube theme by clicking on ‘All files & documentation’ of ‘Download’ button.
2) Login to your WordPress Admin Panel.
3) Click on Appearance -> Themes -> Add New.
4) Click on Upload Theme and choose the theme zip 'Qube.zip’ file (Which you already got by downloading the full package) and click on 'Install Now' button.
5) Activate the Qube theme.
6) Click on ‘INSTALL PLUGINS’ button.
7) Click on ‘Activate all plugins’ button.
8) After successful plugin activation, click on ‘Click HERE to continue with Demo Import process.’.
9) Now, click on the ‘Install’ and 'OK' on the 'Dialog Box' to import the demo.
Now relax and import process will automatically finish and will show you progress on screen (via progress bar).