Layerswp and wordpress

Hi all,
Can someone advise me with this?
I know for layerswp you need to make only child s. Install layerswp and install child and set as default.

I themeforest when upload our pack wordpress, we need to add only child or also this framework, or how is ok?

Because we upload only child and author write us back that there is not theme, is only child theme. Is ok or how is better to be?

Many thanks.