Hey

You don’t need to dalete theme. Only you need to delete which plugin you want to update latest version.

1. Deactivate when you need an update premium plugin/s
2. Delete the plugin first (which plugin you want to update) and Cosmos theme will be inform to you missing plugin/s again
3. install updated version of the plugin/s

Alo can you provide us you admin login? (you can simply reply this as private with your info site url, admin, pass) We’ll install it for your for free!

King Regards
ThemeofWP.com Team