ACTUALLY THERE IS A PROBLEM IN WEBSITE I AM UNABLE TO ADD NEW PLUGIN N NEW THEME(THERE IS NO ADD NEW OPTION) thats why I m not able to update SO CAN YOU PLEASE HELP ME N NEW THEME Please open this screenshot:
https://drive.google.com/open?id=1ViFVXXNcKrKVeQeOwsIlQ5uJKsTBblhu
Well this is not related to theme or any of its plugin .This is something related to your user permissions . Sometimes on some hosts these functionality has been disabled .
Please contact your webhost on this . Or if hired any freelancer to setup your site sometimes they also disables these features , please contact him/her also .