Welcome to the forum, @Rea_K!
Yes. indeed. We are trying to consolidate all of Neuroanatomy plugins, while at the same time removing some of the menu pollution that has been plaguing Fiji. Somehow something went awry. Really sorry you got caught in this.
I expect to push a fix tonight, but please note that in the future all of Neuronanatomy plugins (Sholl, Strahler, SNT, etc) will be served by the Neuroanatomy update. site. It is what makes the most sense here: the development is easier for developers, and users will have a better control over there installation.
I will then post more details. @Rea_K, if you are in an urgent need to use the plugin, you could 1) subscribe to the Neuroanatomy update site or 2) we could try running the plugin from a macro.