public bool AskForUnpackPPKXLocation {get; set;}

//Options are mutually exclusive.

//Setting ApplicationOptions.DownloadOptions.AskForUnpackPPKXLocation = true
//supersedes any value in ApplicationOptions.DownloadOptions.UnpackPPKXLocation
//and will prompt the user on an unpack. The value of 
//ApplicationOptions.DownloadOptions.UnpackPPKXLocation will be unaffected
//and is ignored. This is the same behavior as on the Pro UI.
ApplicationOptions.DownloadOptions.AskForUnpackPPKXLocation = true;//override location

//The default location is typically <My Documents>\ArcGIS\Packages
//Setting ApplicationOptions.DownloadOptions.UnpackPPKXLocation to any
//location overrides ApplicationOptions.DownloadOptions.AskForUnpackPPKXLocation
//and sets it to false. This is the same behavior as on the Pro UI.
ApplicationOptions.DownloadOptions.UnpackPPKXLocation = @"D:\data\for_ppkx";

//Or, if ApplicationOptions.DownloadOptions.UnpackPPKXLocation already
//contains a valid path, set ApplicationOptions.DownloadOptions.AskForUnpackPPKXLocation
//explicitly to false to use the UnpackPPKXLocation
if (!string.IsNullOrEmpty(ApplicationOptions.DownloadOptions.UnpackPPKXLocation))
  ApplicationOptions.DownloadOptions.AskForUnpackPPKXLocation = false;