Version 0.7 brings a slightly modified color palette and the support for Lightly Window Decorations!
To manually install the Global Theme, download the following .zip file, open a terminal in the download location and issue:
kpackagetool5 -i Aritim-Dark.zip
This will install the theme but it will not apply it automatically.
To apply it, reach Plasma's System Settings "Appearance --> Global Theme" section and apply the theme.
If you want to match the screenshots you'll also need to install Lighlty following the instructions you can find in the corresponding repository.