REQUEST HELP WITH THIS ISSUE

The most common cause of being unable to install an optional feature on Windows server is that you have previously configured up Microsoft WSUS (Windows Server Update Services). 

When you click to add a new role or feature, the repository on your local server is checked for the installation files. These probably won't be present as most IT Admins simply select to download only Windows 10 updates for example​

How To Fix Error 0x800F0954​

To bypass WSUS to Install additional Roles and Features from Windows Update, we're going to temporarily bypass WSUS server using the following registry edit (requires administrator privileges).

1. Right-click Start, and click Run
2. Type Regedit.exe and click OK
3. Go to the following registry key:

   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

4. In the right pane, if the value named UseWUServer exists, set its data to 0
5. Exit the Registry Editor
6. Restart Windows.