Windows Update Powershell Commands

The PSWindowsUpdate set of commands is required. If necessary, remove the older module with admin command promt:

@RD /S /Q  C:\windows\system32\WindowsPowerShell\v1.0\Modules\PSWindowsUpdate\

Install the PSWindowsUpdate module:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force
Install-Module -Name PSWindowsUpdate -Confirm:$false -Force
Install-WindowsUpdate -AcceptAll -AutoReboot

Apply all available updates:

Install-WindowsUpdate -AcceptAll

or

Install-WindowsUpdate -AcceptAll -AutoReboot

List all available updates

Get-WindowsUpdate

Show current update settings, including WSUS source server if any:

Get-WUSettings

Show Updates sources and which is default (Desired state is usually "true" for Windows Server Update Service)

Get-WUServiceManager

Show all available commands:

Get-Command -module PSWindowsUpdate

For servers older than 2016, you may need to update to powershell 5.1 first:

https://www.microsoft.com/en-us/download/details.aspx?id=54616

Here is converting from old module to new all in one shot:

@RD /S /Q  C:\windows\system32\WindowsPowerShell\v1.0\Modules\PSWindowsUpdate\
powershell
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
Install-Module -Name PSWindowsUpdate -Confirm:$false -Force
Install-WindowsUpdate -AcceptAll