According to the error message you provided, I checked the help file of GET-WULIST. No matter it is version 1.6.1.1 or 1.5.2.2, there is no INSTALL parameter, so an error will be generated.
https://www.powershellgallery.com/packages/PSWindowsUpdate/1.6.1.1/Content/Get-WUList.ps1
https://www.powershellgallery.com/packages/PSWindowsUpdate/1.5.2.2/Content/Get-WUList.ps1