//destinationURL is download file URL
let pkfile : Data = try! Data(contentsOf: destinationURL)
var pkPasses = [PKPass]()
let pass : PKPass = PKPass(data: pkfile as Data, error: nil)
let pass1 : PKPass = PKPass(data: pkfile as Data, error: nil)
pkPasses.append(pass)
pkPasses.append(pass1)

let vc = PKAddPassesViewController(passes: pkPasses) as PKAddPassesViewController
vc.delegate = self
appDelegate.window?.rootViewController!.present(vc, animated: true, completion: nil)