Public/Search-WinCatalog.ps1

function Search-WinCatalog {
  [CmdletBinding()]
  [Alias('dl-msu')]
  param(
    [Parameter(Mandatory)]
    [String]$KB,
    [ValidateSet('Windows 10','Server 2019')]
    [string]$OS = 'Windows 10'
  )
  $chrome = Join-Path -Path ${env:ProgramFiles(x86)} -ChildPath 'Google\Chrome Beta\Application\chrome.exe' -Resolve
  switch ($OS) {
    'Windows 10' {
      $url = 'https://www.catalog.update.microsoft.com/Search.aspx?q=x64%20windows%2010%20{0}%20' -f $KB
      Start-Process -FilePath $chrome -ArgumentList $url
    }
    'Server 2019' {
      $url = 'https://www.catalog.update.microsoft.com/Search.aspx?q=x64%20server%202019%20{0}%20' -f $KB
      Start-Process -FilePath $chrome -ArgumentList $url
    }
  }
}