Hello. I'm trying to install this kb due to 0day vulnerability in my Exchange 2013. I have a DAG but when I try to install, fails because says some dll are not accesible. I have checked my user has all the permissions to access and write that dll. I tried to copy the dll from the other Exchange 2013 and for some of them, it worked but then, there's another that fails so I can't go on with the update. Some of the dll that fails are in forder: %exchangeserver%\FrontEnd\HttpProxy\bin Any idea about how I can solve it would be appreciated.