If you are running Windows Server 2012 R2, and have Windows 10 Clients that will soon update to the Windows 10 Anniversary update, you should review the following links.
Susan Bradley’s blog on the manual steps required – http://blogs.msmvps.com/bradley/2016/08/11/windows-10-anniversary-update-and-essentials-r2/
Robert Pearman’s blog with some Powershell fixes – https://windowsserveressentials.com/2016/08/05/july-update-rollup-kb3172614-and-windows-10/
Reinstalling he Essentials Client Connector – Cannot download the package. Check these out – https://windowsserveressentials.com/2016/08/08/cannot-download-the-package-essentials-2012-r2/ and https://www.microsoft.com/en-us/download/details.aspx?id=40285