The handler will be attached to the DownloadedDirectoryProgressEvent which is fired as data
is downloaded from Amazon S3. The handler will be passed information detailing how much data
has been downloaded as well as how much will be downloaded.

C# |
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public TransferUtilityDownloadDirectoryRequest WithSubscriber( EventHandler<DownloadDirectoryProgressArgs> handler )

- handler (EventHandler<(Of <(<'DownloadDirectoryProgressArgs>)>)>)
- A method that is called when UploadDirectoryProgressEvent is fired.

this instance of the TransferUtilityUploadDirectoryRequest