Situation: The client has two windows 2016 servers. The Update status shows Downloading updates 0% forever and never completes.
Troubleshooting: 1. Restart the Windows Update services or restart the server.
2. If Windows Defender was failing to update properly through Windows Update, try to update Windows Defender using this command from a terminal window: “%programfiles%\windows defender\mpcmdrun.exe” -signatureupdate -http