I have installed Enscape 2.6 onto a test computer with Rhino 6.
When I open rhino, the Enscape plugin is there.
But the Enscape 2 tabs is not present.
I can manually add the 2 tabs Enscape and Enscape capturing tool bars.
But on older Enscape 188.8.131.52 and older versions...you can check mark Enscape (2 tabs) in rhino options and the 2 tabs show up in toolbar.
see attachments with Enscape 2.6 view and Enscape 184.108.40.206 to see what I am talking about.