A possible solution for https://powershell.org/forums/topic/how-to-specify-which-file-i-want-to-download/

powershell-forum-how-to-specify-which-file-i-want-to-download.ps1

Import-Module BitsTransfer

$Uri = 'http://download.nai.com/products/licensed/superdat/nai/Brazilian'
$DestinationPath = 'D:\Temp'

$Response = Invoke-WebRequest -UseBasicParsing -Uri $Uri
if ($Response.StatusCode -eq 200) {

    $Matches = [regex]::Matches($Response.RawContent, '(\d+xdat\.exe)"')
    if ($Matches.Count -ge 1)
    {
        $LastMatch = $Matches[$Matches.Count - 1]
        $FileName = $LastMatch.Groups[$LastMatch.Groups.Count - 1]

        $Source = "${Uri}/${FileName}"
        $Destination = Join-Path -Path $DestinationPath -ChildPath $FileName

        $Job = Start-BitsTransfer -Source $Source -Destination $Destination -Asynchronous

        Do
        {
           $Percentage = [int](($Job.BytesTransferred*100) / $Job.BytesTotal)
           Write-Progress -Activity "Downloading file..." -CurrentOperation "${Percentage}% complete"
           Start-Sleep -Seconds 1
        } While ($Job.JobState -in 'Connecting', 'Transferring')

        Complete-BitsTransfer -BitsJob $Job

        "Definition file downloaded to ${Destination}"
    }
}