It’s no longer usable as a desktop setting in cinnamon as of today – though, Numix Frost window borders and controls still work.
It basically broke and then disappeared after installing [i:2z593axm]numix-themes[/i:2z593axm] package this morning. Reverting it to the default cinnamon desktop theme.
I think Numix-Blue-cinnamon is the same thing. But it is weird that numix frost is gone.