public string UnpackOtherLocation {get; set;}

{
  //UnpackOther settings control unpacking of anything _other than_
  //a ppkx or aptx. Options are mutually exclusive.

  //Set ApplicationOptions.DownloadOptions.UnpackOtherLocation explicitly to
  //toggle ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation and
  //ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation to false
  //Note: default is typically <My Documents>\ArcGIS\Packages, _not_ null.
  //This is the same behavior as on the Pro UI.
  ApplicationOptions.DownloadOptions.UnpackOtherLocation = @"D:\data\for_other";

  //or...to use a location already stored in UnpackOtherLocation as the
  //default without changing it, 
  //set ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation and
  //ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation to false
  //explicitly. This is the same behavior as on the Pro UI.
  if (!string.IsNullOrEmpty(ApplicationOptions.DownloadOptions.UnpackOtherLocation))
  {
    ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation = false;
    ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation = false;
  }

  //Setting ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation to
  //true overrides any UnpackOtherLocation value and sets 
  //ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation to false.
  //This is the same behavior as on the Pro UI.
  ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation = true;

  //Setting ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation to
  //true overrides any UnpackOtherLocation value and sets 
  //ApplicationOptions.DownloadOptions.AskForUnpackOtherLocation to false.
  //This is the same behavior as on the Pro UI.
  ApplicationOptions.DownloadOptions.UnpackOtherToProjectLocation = false;
}