Download the Latest Peek Professional pre-release version below.
Version Download v6.23.0 (Released October 26th)
The pre-released version is an Enterprise application that allows partner to download the latest update of the Peek Professional on iOS. After you download it and select the app icon on your phone you will see:

To trust the app you will want to go to: General -> Device Management -> Peek Travel, inc -> Trust "Peek Travel, inc" -> Trust. You will now be able to open and use the pre-released app.