Powershell / .NET assembly / GetFiles always delete files

Version : WinSCP 5.0.7 beta
Using powershell

I try
$transferResult = $session.GetFiles($remotePath, $localPath, $false)
Result : it delete the files on the remotePath

I try
$transferResult = $session.GetFiles($remotePath, $localPath)
Result : it delete the files on the remotePath

It works correctly for me.
Can you set $session.DebugLogPath and post or email me the log?

I've send you the log and the code
Did you recieve it?