Please read this article and make sure you have performed those actions. If the issue persists (can not import data) then please send us your wp credentials in a private reply.
The “slider with alias home not found” notification means that there needs to be assigned a slider for that section. With the demo import, you do get pages/posts created but there are some configurations that are needed to be done afterward. Such as assign the slider to home page.
Just go to page’s General Settings > Sliders Options, select one of the created sliders.
