curl -X GET https://api.box.com/2.0/files/12345/content \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'
     -L

Stream fileContents = await client.FilesManager.DownloadStreamAsync(id: "11111");

BoxFile file = new BoxFile(api, "id");
BoxFile.Info info = file.getInfo();

FileOutputStream stream = new FileOutputStream(info.getName());
file.download(stream);
stream.close();

file_id = '11111'
file_content = client.file(file_id).content()

var fs = require('fs');
client.files.getReadStream('12345', null, function(error, stream) {

	if (error) {
		// handle error
	}

	// write the file to disk
	var output = fs.createWriteStream('/path/to/file');
	stream.pipe(output);
});

let url = FileManager.default.homeDirectoryForCurrentUser

let task: BoxDownloadTask = client.files.download(fileId: "11111", destinationURL: url) { (result: Result<Void, BoxSDKError>) in
    guard case .success = result else {
        print("Error downloading file")
        return
    }

    print("File downloaded successfully")
}

// To cancel download
if someConditionIsSatisfied {
    task.cancel()
}