Help Obi Rope - cannot download version with surface-based collisions

[Hatchling]

I've been trying to upgrade Obi Rope to the latest version so I can use surface-based collisions, as advertised in the documentation: http://obi.virtualmethodstudio.com/tutor...sions.html

In the Unity package manager, it shows that the version I have currently downloaded is 6.0.1.

However:

1. None of the ropes in the sample scenes included contain the ability to use surface-based collisions.
   
2. A text search for "surface" through the entire asset after importing it into an empty project contained nothing notable relating to the new feature.
   
3. The changelog only contains "[5.1]" as the latest version.
   

I would like to install the latest version but it appears that it hasn't actually been released yet.

Any help would be appreciated,
-Steve