Plugin Not Found
I am facing the same issue with the Sanmyaku theme (which is unrelated to the creator of this theme, @wptolik, just mentioning)
The addon could not be enabled because it generated a fatal error:
Plugin not found.
Vanilla Version Running:
Theme to display itself
Installing Procedure Followed:
Downloaded theme from https://open.vanillaforums.com/addon/auro2-theme and pasted to the themes folder of my Vanilla installation.