$source = [WinSCP.RemotePath]::EscapeFileMask($latest.FullName)
$dest = (Join-Path $localPath $fileName)
$session.GetFiles($source, $dest).Check()

param (
    $localPath = "C:\downloads\",
    $remotePath = "/Test",
    $fileName = "TestFile.xlsx"
)
 
try
{
    # Load WinSCP .NET assembly
    Add-Type -Path "WinSCPnet.dll"
 
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
        Protocol = [WinSCP.Protocol]::Sftp
        HostName = "My server.co.uk"
        PortNumber = 22
        UserName = "Test"
        Password = "Test"
        SshHostKeyFingerprint = "ssh-rsa 2048 TEST="
    }
 
    $session = New-Object WinSCP.Session
 
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        # Get list of files in the directory
        $directoryInfo = $session.ListDirectory($remotePath)
 
        # Select the most recent file
        $latest =
            $directoryInfo.Files |
            Where-Object { -Not $_.IsDirectory } |
            Sort-Object LastWriteTime -Descending |
            Select-Object -First 1
 
        # Any file at all?
        if ($latest -eq $Null)
        {
            Write-Host "No file found"
            exit 1
        }
 
        # Download the selected file
        $session.GetFileToDirectory($latest.FullName, $localPath) | Out-Null
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch
{
    Write-Host "Error: $($_.Exception.Message)"
    exit 1
}