Dolphin Services "Add-on Installer" not working

Dolphin Services “Add-on Installer” fails to install add-ons.

Is there an error message appearing when you click install or is it just installing fine but not appearing in the menu.
I guess most of the service menus are still only kde sc 4 compatible. Though there is no filter on to distinguish dolphin kf5 based and kdelibs4 based ones.

Anyways. This might be something worth reporting upstream to