$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    FtpMode = [WinSCP.FtpMode]::Passive
    ...
}

#Set up session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = $FTPpath
    UserName = $user
    Password = $pass
    SshHostKeyFingerprint = $fingerprint
}
 
$sessionOptions.AddRawSettings("KEX", "dh-group1-sha1,ecdh,dh-gex-sha1,dh-group14-sha1,rsa,WARN")
$sessionOptions.AddRawSettings("FSProtocol", "2")
 
$session = New-Object WinSCP.Session
 
#Connect
$session.Open($sessionOptions)
 
#Download files
$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.TransferMode = [WinSCP.TransferMode]::Binary
 
$remotePath = Split-Path -Path $FilesToRetrieve -Parent
Write-Host "Remote Path is $remotePath"
 
# Get list of files in the directory
$directoryInfo = $session.ListDirectory($remotePath)
 
# Select the most recent file
$latest = $directoryInfo.Files |
Where-Object LastWriteTime -gt (Get-Date).AddDays(-$LastWriteTimeDays)
Write-Host "LastWriteTime is $latest"