To download this theme:-
If you want to download this theme into your site, you just click the download button. Then this theme will be added to your site's themes/ folder.
You can manage the theme from admin -> settings-> C Advanced -> Site -> Themes . Click on the edit button of the downloaded theme, there you can see various settings for that theme.
Main settings:- Logo: Name of the logo(common-logo.png)
After doing the changes you have to update the theme(click the 'update' button) and then click the reinstall button. Then the changes will appear in the shop.