(PowerShell) Restart/Resume FTP Download

Resume downloading a file from an FTP 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
}

$ftp.Hostname = "ftp.chilkatsoft.com"
$ftp.Username = "****"
$ftp.Password = "****"

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

#  Change to the remote directory where the file is located.
#  This step is only necessary if the file is not in the root directory
#  for the FTP account.
$success = $ftp.ChangeRemoteDir("temp")
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

#  To resume a download, it is assumed that the partial file
#  is already present on the local filesystem.
#  You only need to set the RestartNext property to resume
#  the download.  The Chilkat FTP component sets the resume
#  point by getting the existing size of the target (local) file.
$ftp.RestartNext = $true

$localFilename = "big.zip"
$remoteFilename = "big.zip"

#  Resume downloading...
$success = $ftp.GetFile($remoteFilename,$localFilename)
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

$ftp.Disconnect()

$("File Downloaded!")