You will not be able to proceed with the installation unless all the following criteria are met: - The server must be available ...

You will not be able to proceed with the installation unless all the following criteria are met: 
- The server must be available by using Windows PowerShell remotely.
- The server must be joined to a domain.
- The server must be running at least {0}.
- The currently logged on user must be a member of the local Administrators group on the server.
- Remote Desktop Services connections must be enabled by using Group Policy.
- The server must not be associated with any Remote Desktop Services deployment.