The official Opendesktop App has been released and is available for download here:

https://www.linux-apps.com/p/1175480/

Opendesktop App allows you to “Install” and “Manage” any items downloaded under “My Collection”.
Starting with wallpapers, it is also possibly to directly “Apply” an item from within the App, so a picture is then set as current background under most Linux distros and desktop environments.

For any feedback, please leave a comment on the app page or post in our forums.