[shred00]

At one time, in Kodi 17.x you could "Get more..." skins and Confluence was one of the ones in the list.  That doesn't seem to be the case any more.

Did it get removed from the list of standard available skins for 17.x?

[Hitcher]

It's still there.

[Blakztar]

You can find the skin here

https://github.com/xbmc/skin.confluence