Thanks for responding.
I have no idea what happened but I find it weird that a plugin could cause your theme to reset. Anyway seems like there’s nothing I can do.
Re. the second instruction you gave, I have already read that help page, but it is only for subsequent pages on the site. It does not tell me how to add the Theme4Press slider on the evolve+ static front page, which behaves differently from the other pages on the site. The evolve+ static front page adds a) a slider and b) content boxes above the page content. But the menu does not give me the option to use the Theme4Press slider in this way – only Boostrap, Parallax or Posts.
Thanks for advising me in how to add the correct slider to the top of my static homepage.