This is for 2016 server. But it will work for other versions of Windows
[Net.ServicePointManager]::SecurityProtocol += [Net.SecurityProtocolType]::Tls12
Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
Set-PSRepository -Name "PSGallery" -InstallationPolicy Trusted
Install-Module PSWindowsUpdate -Confirm:$false
Set-PSRepository -Name "PSGallery" -InstallationPolicy Untrusted
Get-WindowsUpdate -AcceptAll -Install -AutoReboot
Happy Patching 🙂