@esmi: I followed through the 4 steps exactly as you said. After step 4, site is offline (libraliyya.org) but when I visit: https://libraliyya.org/wp-admin/ the admin dashboard looks normal except there are NO themes installed.
I did try to rename themese-old back to just themes and plugins.hold back to plugins but when I did that, I get the same error message as the one I pasted above in my second comment.
So, awaiting further instructions and just so that I am exactly at the point where you leave off at step 4, I renamed themes to themes-old again and plugins to plugins.hold. As I said in the beginning of this message, main site is blank page and admin dashboard page looks fine but no themes.
