Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Ftp
    HostName = "ip of ftp"
    PortNumber = port number
    UserName = "user"
    Password = "credentials"
}
$session = New-Object WinSCP.Session
try
{
    $session.Open($sessionOptions)
    
    $transferOptions = New-Object WinSCP.TransferOptions
    $transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
    $transferResult =
        $session.GetFiles($remotePath, $localPath, $False, $transferOptions)
 
    $transferResult.Check()
    foreach ($transfer in $transferResult.Transfers)
    {
        Write-Host ("Download of {0} succeeded" -f $transfer.FileName)
    }
}
finally
{
    $session.Dispose()
}

function FileTransferred
{
    param($e)
 
    if ($e.Error -eq $Null)
    {
        Write-Host "Download of $($e.FileName) succeeded"
    }
    else
    {
        Write-Host "Download of $($e.FileName) failed: $($e.Error)"
    }
}
$session.add_FileTransferred( { FileTransferred($_) } )
$session.Open($sessionOptions)
...
$session.GetFiles($remotePath, $localPath, $False, $transferOptions).Check()