(PowerShell) Synchronize Local Directory Tree

Downloads files from the FTP server to a local directory tree. Synchronization modes include:

mode=0: Download all files
mode=1: Download all files that do not exist on the local filesystem.
mode=2: Download newer or non-existant files.
mode=3: Download only newer files. If a file does not already exist on the local filesystem, it is not downloaded from the server.

Download: Chilkat .NET Assemblies

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

$ftp = New-Object Chilkat.Ftp2

#  Any string unlocks the component for the 1st 30-days.
$success = $ftp.UnlockComponent("Anything for 30-day trial")
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

#  Note: This is a valid FTP account that you may use for testing.
$ftp.Hostname = "ftp.secureftp-test.com"
$ftp.Username = "test"
$ftp.Password = "test"

$ftp.KeepSessionLog = $true

#  Connect and login to the FTP server.
$success = $ftp.Connect()
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

#  Set the current remote directory to the root of
#  the tree to be downloaded.
$success = $ftp.ChangeRemoteDir("/subDir1")
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

#  Recursively download all non-existant and newer files.
$mode = 2
$success = $ftp.SyncLocalTree("c:/temp/subDir1",$mode)
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

$ftp.Disconnect()

#  Display the session log.
$($ftp.SessionLog)