Changing Windows 2012 Core to Full Gui

https://support.microsoft.com/en-us/kb/2913316

Consider the following scenario:

• You have a computer that's running Windows Server 2012 R2.
• The computer is running the Server Core installation option.
• The Server Core option was installed by using Volume Licensing media that doesn't have access to Windows Update.

In this scenario, the feature installation fails. Also, you receive the following error message:

Error: 0x800f081f

The source files could not be found.
Use the "Source" option to specify the location of the files that are required to restore the feature. For more information
on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.


To resolve this problem, use one of the following methods.

Method 1: Connect to the Internet

­If the server can connect to Windows Update for the feature installation, let the server make the connection.

Method 2: Use Windows Server 2012 R2 installation media

If the server cannot connect to Windows Update, download the new Volume Licening media (released on December 11, 2013) and use the Install-WindowsFeature PowerShell command. To do this, follow these steps:

1. Insert the updated Windows Server 2012 R2 DVD into the computer's DVD drive or in a VM mount the media DVD. 
2. Type the following command to determine the index number that's required for steps 3 and 4.
   
   

   Dism /get-wiminfo /wimfile:<drive>:\sources\install.wim

   Note In this command, <drive> represents the actual drive letter.
   
   Example output from the DISM command:
   
   

             Index : 1
             Name : Windows Server 2012 R2 SERVERSTANDARDCORE
             Description : Windows Server 2012 R2 SERVERSTANDARDCORE
             Size : 6,653,342,051 bytes
             Index : 2
             Name : Windows Server 2012 R2 SERVERSTANDARD
             Description : Windows Server 2012 R2 SERVERSTANDARD
             Size : 11,807,528,410 bytes
             Index : 3
             Name : Windows Server 2012 R2 SERVERDATACENTERCORE
             Description : Windows Server 2012 R2 SERVERDATACENTERCORE
             Size : 6,653,031,430 bytes
             Index : 4
             Name : Windows Server 2012 R2 SERVERDATACENTER
             Description : Windows Server 2012 R2 SERVERDATACENTER
             Size : 11,809,495,151 bytes

   Note When you specify the <index> number in the Install-WindowsFeature PowerShell cmdlet in step 4, you must use the index number for the full (non-core) version of the SKU that you currently have installed. For example, if you have Windows Server 2012 R2 Datacenter installed, the required index number is 4. If you have Windows Server 2012 R2 Standard installed, the required index number is 2.
3. Open a PowerShell command prompt by typing the following command:
   
   

   Powershell.exe

4. Type the following PowerShell command, in which <drive> represents the location of the Windows Server 2012 R2 installation files and <index> represents the numbered index from step 2:
   
   

   Install-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell –Source wim:<drive>:\sources\install.wim:<index>

   For example: If your media is on drive F, and you are installing the full version of Datacenter, enter the following command:
   
   

   Install-WindowsFeature Server-Gui-Mgmt-Infra,Server-Gui-Shell –Source wim:f:\sources\install.wim:4