After the successful theme purchase you will receive an email including your individual theme or theme bundle download link.
1.1. Installation via the WordPress admin panel
After downloading the themename.zip file to your computer, please go to Appearance → Themes in your WordPress admin panel and click the Install button at the top of the page. Now click the Upload Theme button and upload the uku.zip file from your computer. You can activate the theme by hovering over the preview image, here you will see the Activate button.
1.2. Installation via FTP
Alternatively you can also install the theme directly to your server with a FTP client (e.g. Filezilla). Just drop the un-ziped theme folder into your …/wp-content/themes/ folder. Now you can see your installed theme in your WordPress admin panel under Appearance → Themes → Available Themes. From there you can activate the theme, so that it will be your active theme.