I followed these directions:
To install a child theme. However when I active the child theme, I get the error message
"Sorry, you can’t activate "Restarter Plus" extension unless you have installed the Restarter WordPress theme."
We will investigate it and include any necessary fix in our next update within next week.
I'm interested in this too. Any update?
Just pushed an update for Restarter plus plugin.
Please update the plugin to the latest version.