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

[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 TransferUtilityDownloadRequest WithSubscriber(
	EventHandler<WriteObjectProgressArgs> handler
)