2013 sp1 update to cu5 fails

the update fails at the transport service step 10 of 17.

Upgrade the MSAV engine if the version on disk is older than the packaged version";

Error:
The following error was generated when "$error.Clear(); 
            Write-ExchangeSetupLog -Info "Upgrade the MSAV engine if the version on disk is 

older than the packaged version";

            $FipsDataPath = [System.IO.Path]::Combine($RoleInstallPath, "FIP-FS\Data");
            $FipsEnginesPath = [System.IO.Path]::Combine($FipsDataPath, "Engines");
            $FipsMsavEnginePath = [System.IO.Path]::Combine($FipsEnginesPath, 

"amd64\Microsoft\Bin");

            # Copy Microsoft Engine to Engines folder during the install
            $FipsBinPath = [System.IO.Path]::Combine($RoleInstallPath, "FIP-FS\Bin");
            $MicrosoftEngineSourcePath = [System.IO.Path]::Combine($FipsBinPath, "Engine

\Microsoft");
            $MicrosoftEngineSourceBinPath = [System.IO.Path]::Combine

($MicrosoftEngineSourcePath, "Bin");
            $MicrosoftEngineDestinationPath = [System.IO.Path]::Combine($FipsEnginesPath, 

"amd64\Microsoft");

            $ShouldUpgradeMicrosoftEngine = $true

            if(Test-Path -Path $MicrosoftEngineSourceBinPath)
            {
              $EngineDirectories = dir $MicrosoftEngineSourceBinPath -Recurse | Where 

{$_.psIsContainer -eq $true};
    
              if(!$EngineDirectories)
              {
                  Write-ExchangeSetupLog -Error "MSAV Engine Version directory is missing.";
                  break;
              }

              $UpgradeVersion = [System.Int64]::Parse($EngineDirectories[0]);
              Write-ExchangeSetupLog -Info "UpgradeVersion = $UpgradeVersion";

              if(!(Test-Path -Path $FipsMsavEnginePath)) {New-Item $FipsMsavEnginePath -

ItemType Directory}
              Foreach ($dir in dir $FipsMsavEnginePath -Recurse | Where {$_.psIsContainer -eq 

$true})
              {
                if($UpgradeVersion -le [System.Int64]::Parse($dir))
                {
                  $ShouldUpgradeMicrosoftEngine = $false;
                  break;
                }
              }

              Write-ExchangeSetupLog -Info "Should Upgrade Microsoft Engine? 

$ShouldUpgradeMicrosoftEngine";
              if($ShouldUpgradeMicrosoftEngine)
              {
                get-childitem $MicrosoftEngineDestinationPath -recurse | remove-item -recurse
                Robocopy $MicrosoftEngineSourcePath $MicrosoftEngineDestinationPath /S 

/COPYALL
              }
            }
            else
            {
              Write-ExchangeSetupLog -Error "Microsoft engine is not installed properly or the 

directory is missing.";
            }
          " was run: "Exception calling "Parse" with "1" argument(s): "Input string was not in 

a correct format."".