I took one for the team and acquired the BMW Service Repair Workshop Manual which contains all service relation information for the Z4 platform, troubleshooting, diagrams, etc.
It's not for the faint of heart; It's a 6GB download and has instructions included on how to setup and get it working. Basically, it is a Virtual Machine that you will start up and run on your PC or Mac. I have tested it and can verify it works well on my Mac.
Enjoy...
https://www.dropbox.com/sh/qxy2dzgrp...C9GQPZVfa?dl=0