When you try to install any Windows Server 2012 R2 role or feature, Windows requires the original setup files.
You can use the CD and specify the path, or you can use the steps written below to set the path to for example a network location.
1.Start the Local Group Policy Editor or Group Policy Management Console (gpedit.msc)
2.Expand Computer Configuration, expand Administrative Templates, and then select System.
3.Open the Specify settings for optional component installation and component repair Group Policy setting, and then select Enabled.
4.Select the Contact Windows Update directly to download repair content instead of Windows Server Update Services (WSUS) check box, and specify the alternative path.
