not sure if its been picked up but when trying to open options it comes up wiht a text " Rarity: The Rarity Options module has been disabled. Log out and enable it from #your add-ons menu"

FYI: In the latest release, you should be able to open the options even if the module has been disabled.
You can then load and enable the Rarity_Options addon seamlessly, and it should populate the UI automatically.

(This was implemented in #845)