Whether you are managing an air-gapped environment or a single machine without internet access, using the is the standard way to upgrade Windows 7 SP1, Windows 8.1, and various Windows Server versions to match the management capabilities of Windows 10 and Server 2016. WMF 5.1 Offline Installer Download Links
Use the Package resource to install WMF 5.1 offline via a file share: wmf 5.1 offline installer