Resolve method unavailable on WinSCP.ComparisonDifference

try
{
    # Load WinSCP .NET assembly
    Add-Type -Path "D:\Job Data\Temp\Alpha\WinSCP-Automation\netstandard2.0\WinSCPnet.dll"
 
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
            Protocol = [WinSCP.Protocol]::Ftp
            HostName = "xxx"
            UserName = "xxx"
            Password = "xxx"
            FtpSecure = [WinSCP.FtpSecure]::Implicit
            TlsHostCertificateFingerprint = "xxx"
    }
    $session = New-Object WinSCP.Session
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        $remote = "/Index Data"
        $local = "D:\Job Data\Temp\Alpha\Index Data"
        $differences = $session.CompareDirectories([WinSCP.SynchronizationMode]::Local, $local, $remote, $true)
 
        Write-Host
        if ($differences.Count -eq 0)
        {
            Write-Host "No changes found."   
        }
        else
        {
            Write-Host "Synchronizing $($differences.Count) change(s)..."
            
            foreach ($difference in $differences)
            {
                try
                {
                    $difference.Resolve($session) | Out-Null
                    Write-Host " Done."
                    
                }
                catch
                {
                    Write-Host
                    HandleException $_
                }
            }
        }
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch
{
    Write-Host "Error: $($_.Exception.Message)"
    exit 1
}