You have to be super-user (sudo)
Put the folder Dynamic_Wallpapers in :
- On GNOME, CINNAMON : /usr/share/backgrounds/
- On KDE : /usr/share/wallpapers/
Put the content of the xml folder in :
- On GNOME : /usr/share/gnome-background-properties/
- On CINNAMON : /usr/share/cinnamon-backgrounds-properties/
Then change your wallpaper in your system settings.