Ionic downloader return true when download is finished

Hello guys. i use downloader for my apk. mys code is:

var req: DownloadRequest = {
                  uri: 'https://xyz.com',
                  title: 'TryMe' ,
                  description: 'TryMe',
                  mimeType: "video/mp4",
                  visibleInDownloadsUi: true,
                  notificationVisibility: NotificationVisibility.VisibleNotifyCompleted,
                  destinationInExternalFilesDir: {
                    dirType: 'Downloads',
                    subPath: 'MyFile.apk',
                  }
                };
this.dwn.download(req)
      .then((location: string) => {
        alert(location)
      }).catch((err) => {
        alert("DWN ser Err 42: " + JSON.stringify(err))
        return "";
      })

i want to stop another functions when file is downloading. The program and functions are continue when downloading is finish. how can i do it? 

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