1. Generate zip archive from the admin backpanel from Admin->Find wedsite-> Generate zip archive of site. 
  2. If nothing happens after 10 mins then visit http://<wedsitename>.nearlyweds.com/?update_sifr=1 in Firefox.
  3. Go back to Admin->Find wedsite-> Generate zip archive of site and see if that works. If it does, then there should be a link to download wedsite right next to the generate zip archive link.