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
        }
    }
}